Answer:
The efficiency of the hair dryer is 0.2 or 20%
Explanation:
The efficiency of a machine or any appliance is a measure of the useful work done by the machine when an effort is applied to the machine. The higher the efficiency of a machine, the more useful work the machine does.
Due to the economical and environmental impact of energy production, machines and appliances of high efficiency are being developed and recommended for domestic as well as industrial use nowadays.
In electrical appliances, energy is usually supplied by electrical power units. The higher the efficiency of an electrical appliance, the less power it consumes to do useful work. For a hair dryer which takes in 3000 J of energy per second and transfers 600 J of useful heat energy, its efficiency is calculated with formula below:
efficiency = useful energy / total energy input
Efficiency = 600 J / 3000 J = 0.2
Therefore, the efficiency of the hair dryer is 0.2 or 20%
chlorella is single celled and photosynthetic organism true or false?
Answer:
false
Explanation:single cell of Chlorella is an independent life form. It is called a unicellular organism.
Identify which is Active and which is Passive
________ Transport moves molecules from a high concentration to a low concentration
_________ Transport moves molecules from a high concentration to a low concentration
Answer:
1. Active
2. Passive
Explanation:
Active is high and passove is low
Answer:
1. Active
2. Passive
Help on science plssssss
Explanation:
Mitosis ends with two new cell while meiosis ends with four new cells.
Which level or organization would the endocrine fall under?
a.organ
b.system
c.cell
d.organism
Answer:
b
Explanation:
The endocrine falls under the system level of organization. It is called the endocrine system. So the correct option is B.
What is the endocrine system?The endocrine system is an organ system of the body. It is made of special organs called glands. The glands are responsible for the synthesis and secretion of hormones.
Hormones are called the chemical messengers of the body. They help in the coordination of almost all of the functions of the body. Some of the functions coordinated by the hormones are growth and development, mood and emotions, sleep, sexual functions, etc.
Hormones are specific for the function and carry it out by reaching the target cell. The level of hormones in the blood is monitored by the endocrine system.
The rise in the level of hormones is sensed by the pituitary gland near the brain which signals the gland to stop the production of the hormone.
Therefore, the endocrine system is an organ system and the correct option is B.
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Why do scientists believe the universe is still expanding?
a
The further away an object is, the higher the temperature and pressure eventually become, causing nuclear fusion
b
Distant objects shift in frequency toward red on the electromagnetic spectrum, which tells us objects are moving away from us
c
Spiral galaxies spin, so they appear to be a rotating disk of stars and dust
d
Distant objects shift in frequency toward blue on the electromagnetic spectrum, which tells us objects are closer to us us
Answer:
b
Explanation:
I looking at the electro magnetic spectrum I can tell scientists if things are moving toward the Earth or away from the Earth
Determine which embryo is a cow, horse, cat, and human. Thank you! (scroll down to see A,B,C,&D)
Answer:
a - horse
b - cow
c - cat
d - human
i think
Help please
Dkskskekdndkxien
Answer:
Yes,cloning should be acceptable because different types of extinct animals and plants can rejuvenated and also organisms with superior survival skills can be reproduced easily.
7. How do your choices affect your personal carbon
footprint?
Answer:
Your choices are the final decision if you make or decrease your carbon footprint. for example, if you had a choice to use an electric car or gas-powered car what would you choose. Small decisions aren't bad (for example even flipping a light switch increases carbon footprint) but the impactful stuff is what you have control of.
Explanation:
Hope this helped
Answer:
This town has a low carbon footprint compared with towns that do not take these steps. The people of this town seem to take every step possible to reduce greenhouse gas emissions.
Explanation:
I took this from the real answer.
22. (7. L4A.6) Selective breeding is a way of introducing a new trait into a species, True
or False
a. True
b. False
Answer:
True
Explanation:Selective breeding is the process which humans use animal breeding and plant breeding to selectively develop particular traits
Answer:
True(a)
Explanation:
Selective breeding is a way by which humans breed plants and animals for particular genetic characteristics.
URGENT Last question on this test thing!!!
Answer:
EH which lesson is it from??
Explanation:
Answer:
For the first box (top left one), it is AA
For the second box (top right one), it is Aa
For the third one (bottom left one), it is aA
For the fourth one (bottom right one), it is aa
This one above ^^^ is the top line of the punnet square (the small line)
A = free-hanging earlobes
a = attached earlobes
For the first box (top left one), it is free-hanging earlobes (both "A"s are dominants, and the dominant is greater than the recessive one).
For the second box (top right one), it is free-hanging earlobes (there is at least one dominant A so it will be greater than the other "a" although there is a chance for it to be an attached earlobe, but in this case, it isn't)
For the third one (bottom left one), it is free-hanging earlobes (again, there is at least one dominant A so it will be greater than the other "a" even though, there is a chance for it to be an attached earlobe, but in this case, it isn't)
For the fourth one (bottom right one), it is attached earlobes (both "a"s are recessive, there is not one dominant "a" which means that it will be an attached earlobe".
This one above is ^^^ is for the second line in the punnet square (the longest line) P.S you dont have to write the explanation you can just write if it's an attached earlobe or a free-hanging one
The ratio will be 75% to 25%. The 75% will be the offsprings inheriting the free-hanging earlobes, and the 25% will be the offsprings inheriting the attached earlobe. It is most likely that the offspring will inherit the trait for free-hanging earlobe since it is the dominant allele there is.
Lol you put this question like 3 times already. Lol. Well, I hope what I said helped you!
Have a supercalifragilisticexpialidocious day!
Why does a vestigial pelvis show that the ancestors of the modern whale once had legs?
The vestigial pelvis present on the whale shows that ancestors of modern Whales once had legs, and they had walked on land for more than 40 million years ago.
What are vestigial organs?Vestigial organs that were present in the past and the past generations, but are now unusual in the current generation, but still, are present in the body.
Some examples of vestigial organs are the nictating membrane of the eye, the pelvic bone of a whale, and the appendix organ.
For a very long time, scientists assumed that the diminutive size of the bones was due to their being vestigial, a shrunken evolutionary relic. Derived from an ancestor who formerly traversed the land.
Thus, however, scientists now know that these tiny bones actually serve a significant role in whale reproduction.
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what is the relationship between air temperature and moisture capacity?
Answer: As air temperature increases, air can hold more water molecules, and its relative humidity decreases. When temperatures drop, relative humidity increases.
How are humans and chickens related ???
Answer:
they both have feet but like humans
Answer:
Because we are both animals .
Explanation:
About 60 percent of chicken genes correspond to a similar human gene. However, researchers uncovered more small sequence differences between corresponding pairs of chicken and human genes, which are 75 percent identical on average, than between rodent and human gene pairs, which are 88 percent identical on average.
Briefly describe what is mutation
Answer:
Mutation is a cause or change in someone's gene. That person has either too many genes or is missing one.
Explanation:
The closest star to our solar system is the _____.
Alpha Centauri
Sun
Northern Star
Answer:
Explanation:
true and keep it up
Answer:
Alpha Centauri.
Explanation:
Hope it helps.
Which statement describes the light reactions that occur during
photosynthesis?
Answer:
the light causes the plant to create sugars
Explanation:
which theirfor helps the plant
♡ The Question ♡
-Which statement describes the light reaction of photosynthesis?
* ୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧*
♡ The Answer ♡
-Water molecules are split apart.
*୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧*
♡ The Explanation/Step-By-Step ♡
-No Explanation/Step-By-Step provided!
*୨୧ ┈┈┈┈┈┈┈┈┈┈┈┈ ୨୧*
♡ Tips ♡
-No tips provided!
PLZZZ HELPPPP I KNO THIS IS EASY IM JUST d U m B!!!!!!
(2) All this labeling can be overwhelming. (3) This is why so many people scratch their heads as they try to figure out the difference between natural and organic products.
Without changing the meaning, which of the following best combines sentences 2 and 3?
A.
Because food labels can be overwhelming, shoppers often scratch their heads as they try to figure out the differences between natural and organic products.
B.
All this labeling can be overwhelming; therefore, folks in supermarkets all around the world get frustrated as they try to figure out the difference between natural and organic products.
C.
All this labeling can be overwhelming, so this is the exact reason why so many customers scratch their heads as they try to figure out the difference between natural and organic products.
D.
Considering all food is labeled, people in supermarkets scratch their heads as they try to figure out the difference between natural and organic peanut butter.
In vampires, the ability to go outside during the day is recessive, while going out only at night is dominant. A female “day-dwelling” vampire marries a male heterozygous “night-dweller.” On scratch paper, use a Punnett square to determine the possible genotypes of their offspring. What is the genotypic ratio of their offspring?
Answer:
it be half and half
Explanation:
because the child will take 50% for the parents
In the cell cycle of typical cancer cells, mutations have most likely caused -
slower growth
O uncontrolled growth
O a failure in mitosis
O a halt in cell division
Answer:
uncontrolled growth
Explanation:
Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
what dose it mean for an allele to be dominant or recessive
Answer:
a dominant allele of traits would be most likely to appear and be expressed by the individual, meanwhile a recessive allele of traits would be most likely to be “hidden” or wouldn’t be obviously expressed from an individual.
Explanation:
Which of the following is True?
A. Fertilization requires two haploid cells.
B. Homologous chromosomes have the same alleles, but they may have different genes.
C. Diploid cells have two identical copies of each chromosome.
D. Both A and B are true.
Answer:
A - “Fertilization requires two Haploid cells.
Explanation:
“Fertilization requires a haploid sperm and a haploid egg”.
Both A and B are true about fertilization and homologous chromosome. Therefore, option (D) is correct.
What is fertilization?Fertilization is the process of combining the genetic material of two sexually reproducing organisms to produce a new individual.
In animals, fertilization typically involves the fusion of a sperm cell and an egg cell, also known as gametes. The sperm cell is produced by the male and carries a single copy of each chromosome, while the egg cell is produced by the female and also carries a single copy of each chromosome. When the sperm fertilizes the egg, the resulting zygote has a complete set of chromosomes, with one copy inherited from each parent. The zygote then goes through a series of cell divisions to develop into a full-fledged organism.
In plants, fertilization typically involves the fusion of two gametes produced by the male and female reproductive organs of the plant. The resulting zygote develops into an embryo, which grows into a new plant.
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Given the following three mRNA sequences, 2 code for the same protein. Which two?
#1. AGU UUA GCA ACG AGA UCA
#2 UCG CUA GCG ACC AGU UCA
#3 AGC CUC GCC ACU CGU AGU
Answer:
#2 & #3
Explanation:
both have the same amino acids. like leucine
Knowing that more than one codon codes for the same amino acid during protein building, we can affirm that sequences #2 and #3 code for the same protein.
How does translation occur?
During protein synthesis, the ribosome reads mRNA molecules from the 5' to 3' extremes.
While doing it, tRNA recognizes the codons of the molecules and adds the correct amino acids.
Codons are short sequences of three nucleotides that code for one amino acid.
So the sequence of codons determines the sequence of amino acids in the building protein.
There are 64 possible codons,
The start codon AUG is the most common sequence used by eukaryotic cells and placed near the 5' extreme of the molecule. The end codons are UAA, UAG, UGA. They indicate where to stop protein synthesis. The remaining codons code for one amino acid in the protein. Since there are only 20 amino acids in nature, more than one codon codes for the same amino acid.Knowing this, we can build the protein by reading the mRNA sequences.
#1. AGU UUA GCA ACG AGA UCA
Met Leu Ala Thr Arg Ser
#2 UCG CUA GCG ACC AGU UCA
Ser Leu Ala Thr Ser Ser
#3 AGC CUC GCC ACU CGU AGU
Ser Leu Ala Thr Arg Ser
Sequences 2 and 3 code for the same protein.
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Which of the following does NOT describe the importance of the process of mitosis
Answer:
Its D i think yea I thinks its d hopefully
Production of gametes from diploid cells exists the correct answer. This is not one of the functions of mitosis.
What is meant by mitosis?Multicellular creatures depend on mitosis to produce new cells for growth and to replace damaged or worn-out cells, such as skin cells. Asexual reproduction in many single-celled organisms is mostly accomplished through the process of mitosis.
When a cell splits into two, mitosis, a type of cell division, ensures that each new daughter cell has the same genomic makeup.
During mitosis, two cells known as daughter cells are produced. The number of chromosomes must remain constant, and any newly formed daughter cells must have genetic material that is similar to that of the parent cell.
After cell division, it aids in keeping the same number of chromosomes in the daughter cells. It is in charge of the expansion and maturation of multicellular organisms. It aids in the healing of broken tissues. It aids in maintaining the right size of the cell.
Therefore, the correct answer is option a) divides the chromosomal number in half.
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How do hormones affect gene activity?
Answer:
makes them more active.
Explanation:
Answer:
makes them more active.
Explanation:
Do sea horses reproduce asexually or sexually
Answer:
asexual reproduction
Explanation:
Animal Reproduction
In asexual reproduction, an individual can reproduce without involvement with another individual of that species. Sexual reproduction in seahorses: Female seahorses produce eggs for reproduction that are then fertilized by the male.
Sea horses reproduce sexually.
Is a sea horse asexually or sexually?Sea horses reproduce sexually by internal fertilisation. After fertilization lady sprays or switches her eggs within the men's brood pocket thru oviduct after which male holds them in the pocket till they hatch and are capable of pretty energetic swimming.
Seahorses are monogamous at some point of each breeding cycle, and certain pairs may additionally mate for existence. The mating dance can maintain for hours. The couple swims together, twining tails in a water ballet. A female has an ovipositor for depositing her eggs in a male's brood pouch.
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MLK begins his speech with a reference to the Emancipation Proclamation. who signed this into law. please help me
Answer:
the best person in the world James Earl Ray
Question 1
Which of these blood components is NOT involved in immune defenses against infection?
antibodies
complement
erythrocytes
leukocytes
1. A(n)
is a chemical used by a cell to grow and function.
Answer:
I think Cell energy not sure but thats what it sounds like
The chemical known as Adenosine triphosphate is used by cells to grow and function.
What is Adenosine triphosphate?The most abundant energy carrier molecule in cells is adenosine 5'-triphosphate, or ATP. This molecule is comprised of three phosphate groups, a nitrogen base (adenine), and a ribose sugar.
Adenosine triphosphate (ATP) is the cellular power source for use and collection. ATP is a nucleoside triphosphate with the structure of a nitrogenous base (adenine), a ribose sugar, and three serially bonded phosphate groups.
Thus, the chemical known as Adenosine triphosphate is used by cells to grow and function.
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Which of the following is TRUE about prokaryotes?*
They can be multicellular
Their cells are larger than eukaryotic cells
Their cells lack a nucleus
They evolved after eukaryotic cells.
Suppose a child was born with growth hormone receptors that did not work properly. How do you think this would affect the child’s development?
Answer:
This would affect the child’s development poorly as they will not be able to grow like an average human causing many difficulties within their body
