In many parts of the world, there is a rock layer rich in the metal iridium. Iridium is very rare on Earth, but it is relatively common in meteorites and other debris that comes from outer space. All occurrences of this iridium layer are from the same geologic epoch, at the very end of the Cretaceous. Most of the fossils in rock layers below the iridium layer, including dinosaur fossils, do not appear in layers above the iridium layer.

Based on this evidence from the rock and fossil record,
A.
meteoroids and other space debris did not impact the Earth at the end of the Cretaceous.
B.
an asteroid impact likely caused a mass extinction at the end of the Cretaceous.
C.
meteorites and other space debris no longer contain the metal iridium.

Answers

Answer 1

Answer:

B.  

an asteroid impact likely caused a mass extinction at the end of the Cretaceous.

Explanation:

I did this assinment.


Related Questions

Consider the table.

Types of Bacteria
Form
Shape
Associated disease
Coccus
X
Strep throat
Bacillus
Rod shaped
Y
Spirillum
Spiral
Cholera

Which best describes X and Y?
Which best describes the lysogenic cycle?

Answers

Answer:

x is spherical.... y is e.colii

Unlike the lysogenic cycle, the lytic cycle involves destruction of the host.

There are 252 deer in a population. There is no net immigration or emigration. If 47 deer die and 32 deer are born in one month, what is the population size at the end of the month? Round your answer to the nearest whole number

Answers

Answer:

240

Explanation:

252-47=205

205+32=237

237 to the nearest whole number is 240

hope it helps

At the end of anaphase 1 (meiosis), how many
chromosomes are on each side?

Answers

there are 46 chromosomes or 23 pairs of homologous chromosomes (:

different versions of the same gene (represented
with letters)?

Answers

Answer:

Different versions of a gene are called alleles. Alleles are described as either dominant or recessive depending on their associated traits

Explanation:

Mike and Mack are identical twins. Which statement might explain why Mike developed lung disease and Mack did not?

Answers

Answer:

mike could have smokeed and mack could have done alot of atheletic stuff they also could have been born with differneent genes

Explanation:

The clear, transparent layer of cells that covers the front part of the eye is called

1)the iris

2)the pupil

3)the retina

4)the cornea



Answer and I will give you brainiliest

Answers

Answer:

4 Cornea

Explanation:

The cornea is the white cell covered your eyes

Did the inner or outer planets form first?

Answers

Answer:

inner planets

Explanation:

Which of the following statements about the cells of any multicellular organism is true? More than one answer may be correct.

Answers

Answer:

C.) (Different genes are expressed in different types of sells.)

Explanation:

I hope its help;)(;


1. Suppose you lived over 100 years ago and you had a whole bowl of
fresh milk but only one cup of yogurt left. Describe how you might
make more yogurt?

Answers

Answer:

Lactic Acid Fermentation

Explanation:

Lactic acid fermentation is a metabolic process by which glucose or other six-carbon sugars are converted into cellular energy and the metabolite lactate, which is lactic acid in solution. Lactate, which is just the deprotonated form of lactic acid, gives the process its name. The bacteria that make yogurt carry out lactic acid fermentation, as do the red blood cells in your body, which don't have mitochondria and thus can't perform cellular respiration.

hope this helps have a nice day

Suppose that you are an explorer who has found a new species of plant. Some of the plants have red flowers and some have yellow flowers. You cross a red-flowered plant with a yellow-flowered plant and all the offspring have orange flowers. What is the most probable explanation

Answers

Answer:

Incomplete dominance

Explanation:

In genetics, incomplete dominance refers to an inheritance mode in which two gene variants (i.e., alleles) of the same locus combine in a way that neither allele dominates the other. This phenomenon is similar to codominance, but in this last case, both alleles are dominant. Incomplete dominance produces a new phenotypic trait resulting from the combination of both non-dominant alleles. An example of incomplete dominance includes the pink color of snapdragons resulting from the cross of red-flowered snapdragons with white-flowered snapdragons.

Consider your knowledge about the cell membrane and check all of the true statements below.

Answers

only animals have a cell membrane

The true statements are the phospholipid bilayers that surround all the eukaryotic cells. Both the plant and the animal cell membranes are considered to have fluid mosaics. Thus options B and D are correct.

What is a cell membrane?

A cell membrane is a plasma membrane and is found in all cells and separated by in the interior of the cell from the outside of the environment. The cells consist of a liquid bilateral layer. Ths results the transportation that arrives from the cells.

Find out more information about the cell membrane.

brainly.com/question/21409184

Order the carbohydrates from smallest to largest: Starch Glucose Sucrose

Answers

Answer:

glucose, sucrose, starch

Differences between blood cells and cheek cells?

Answers

Answer:

Human red blood cells Human cheek cells Does not have nucleus. Have nucleus. Biconcave shape. ... Animal cells do not have cell wall and the cells are in irregular shape whereas plant cells have cell wall and the cells are in regular shape.

Explanation:

Goodluck


Mendel studied 7 traits in pea plants. One of the monohybrid crosses he made was between plants with round seeds (R) and plants with wrinkled
seeds (0)
Seed
Shape
Round
х
Wrinkled
Round
What was a conclusion that Mendel drew from the F2 generation of this cross?
A.
Three fourths of the F2 plants show the round seed phenotype and carry the dominant allele for roundness.

Answers

Answer:

option A

Explanation:

option A is the correct answer of this question .

plz mark my answer as brainlist plzzzz vote me also.

hope this will be helpful to you.

three fourth of f2 plant showed round seed phenotype and carry dominant allele for round ness character.

what is dominant character ?

allele can be defined as a form of a gene which can be present as a pair shows either homozygous or heterozygous phenotype of a character.

these gene can express the phenotype either dominant or recessive form. In a cross between two organism, in F2 generation the offspring's are produced shows three phenotypes homozygous dominant, recessive, heterozygous dominant.

dominant allele can suppress recessive allele.

For more details regarding character, visit

https://brainly.com/question/4222246

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Which of the following is used to describe DNA's double helix shape?

A. folded ladder
B. twisted pentagon
C. twisted ladder​

Answers

the answer is C, twisted ladder

Answer:

twisted ladder

Explanation:

4. Which of the following is NOT a disadvantage of asexual reproduction?
1do not need a mate
2little genetic variation
3mutations can occur
4all susceptible to same diseases

Answers

Answer:

4

Explanation:

The advantage of asexual reproduction is that it does not need a mate. Only one parent is needed for asexual reproduction.

What is asexual reproduction?

Asexual reproduction is a type of reproduction where  only one parent is need and it does not involve fusion of gametes.

It does not involve exchange of chromosomes.

The offspring that arise by asexual reproduction are genetically and physically identical to each other.

Advantages of asexual reproduction includes :

no need of matemore efficient faster than sexual reproductiongenetically identical offspring generated etc.

To know more about asexual reproduction :

https://brainly.com/question/423209

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Which of the following is paired correctly? *
Phenotype- BB
O Genotype- Ft
Acquired trait-eye color
Inherited trait-tattoo

Answers

The answer is the genotype

Need answer please asap

Answers

I believe it is C if i am not mistaken

true or false: the seasons are caused by earths orbit around the sun in combination with the tilt of earths axis

Answers

Answer:

True

Explanation:

Depending on the were the Earth is facing depends on the weather and climate.

Describe the
functions of the cell membrane
and cell wall

Answers

Answer:

cell membrane: provides protection for a cell . It also provides a fix environment inside the cell and the membrane has several different fonctions . One is to transport nutrients into the cell and also transports toxic substance out of the cell.

cell wall: cell wall is a structual layer sorrounding some types of cells , just outside the cell membrane . it can be tough , flexible ,and sometimes riding. it provides the cell with both structual support and protection , and also acts as a filtering machine.

A cactus is a type of plant that grows in the desert. An adaptation cacti have developed to survive in the hot and dry desert is
A)
the use of desert insects for their pollination
B)
the ability to create shade to avoid the hottest part of the day
the development of spines to discourage birds from landing on them
D)
the ability to store large amounts of water in their stem and roots.

Answers

Answer:

D is the answer

Explanation:

Answer:

D

Explanation:

in the nitrogen cycle, nitrogen can return to the lithosphere directly from the atmosphere by

Answers

Answer:

a small amount of nitrogen is fixed by lightning, but most of the nitrogen harvested from the atmosphere is removed by nitrogen-fixing bacteria and cyanobacteria (formerly called blue-green algae). The nitrogen cycle transforms diatomic nitrogen gas into ammonium, nitrate, and nitrite compounds.

Hope that helps!

Which of the following is the correct equation for GPE?
A. Height x mass x gravitational field strength
B. (mass x height) gravitational field strength
C. None of these
D. (mass x gravity) height

Answers

Answer:

C. Nenhum desses

A GPE é dividida em quatro variáveis:

• Anamnese: histórico de saúde, ambiente e hábitos de vida;

• Estrutura Corporal: massa e altura; perímetros, dobras cutâneas e avaliação postural;

• Função da estrutura corporal: identificação das fragilidades corporais, mobilidades e estabilidades;

• Função Cardiorrespiratória: determinação do consumo máximo de oxigênio, intensidade do treinamento, frequência cardíaca em repouso e no esforço, pressão arterial em repouso e no esforço e limite anaeróbio

Which of the following statements about the process of science is accurate?
A. Science does not use evidence and data collected to advance our understanding of natural and supernatural phenomena.
B. Science attempts to solve a problem by evaluating the plausibility of only one solution without considering other possible explanations.
C. Science is a systematic method of procedures designed to answer questions by evaluating evidence.
D. Science can answer all questions regarding the human experience and personal values.

Answers

Answer:

C

Explanation:

The correct answer would be that science is a systematic method of procedures designed to answer questions by evaluating evidence.

Science is generally defined as man's way of obtaining knowledge about his natural environment through the evaluation of evidence available to him. Science follows a laydown procedure to obtain evidence through data collection, analyze such, and arrive at reasonable conclusions. This laydown procedure is referred to as the scientific method.

Hence, that science does not use evidence and data collected to advance the understanding of natural and supernatural phenomena is an antithesis to what science represents.

Science only arrive at conclusion after evaluating all available evidence associated with a phenomenon. That it attempts to solve a problem by evaluating the plausibility of only one solution without considering other possible explanations is, therefore, not true.

Science continuously seeks knowledge in order to understand the natural world. Hence, while science has been able to answer several questions about man and his natural world, several questions still have their answers pending. That science can answer all questions regarding the human experience and personal values is, therefore, far from being true.

The only accurate option that describes science is C.

The best description of science is that science is a systematic method of procedures designed to answer questions by evaluating evidence.

What is science?

Science is defined as the process by which man obtain knowledge about his natural environment through observation and critical evaluation of facts and evidences in order to arrive at a conclusion.

The scientific method is as follows;

ObservationAsking questionsmaking hypothesisconducting experimentsanalysis and statement of laws.

Therefore, science is a systematic method of procedures designed to answer questions by evaluating evidence.

Learn more about the scientific method at: https://brainly.com/question/17216882

Why are Mercury Seasons difficult to determine? Explain why.​

Answers

Mercury's seasons are difficult to determine. This is because it has virtually no tilt (0.03 degrees), but a highly elliptic orbit. ... Mercury also has a bizarre rotation, spinning three times (every 53 Earth days) over two rotations around the Sun, making it impossible to tell when one season begins and one ends.

help a girl out please thanks:))

Answers

I think it’s A because animal cells do not contain cytoplasm

Answer: to me its either a or c!

but i mostly feel like its c!

Explanation:

hope i helped, sorry if i got this answer wrong!

in the blank circle, draw the moon phases we would see if we were on Earth in the diagram and then write the name of that moon phase on the blank line

Answers

Answer:yThe Moon has phases because it orbits Earth, which causes the portion we see illuminated to change. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days. ... As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

Explanation:

Please help fasttttt!!!!!
7 Identify What type of eclipse is shown in
the diagram?

Answers

Answer:

I dont know

Explanation:

I need points :)

Solar eclipse is the one shown in the diagram

What might happen if smaller fish had to leave one area of the ocean because the temperature changed?

A. the plants in that area could not survive
B. the small fish would eat the plankton
C. the large animals might lose their food source
D. the ocean waves might change

Answers

Answer: C

Explanation: Because the larger animals might starve if they don’t any smaller fishes to feed on unless they also leave the area or change there diet.

Most eukaryotic mRNAs are shorter than the genes that encode them. The reason for this is __________.
A. that exons are spliced out of the hnRNA
B. that introns are spliced out of the DNA
C. that eukaryotic genes contain both introns and exons
D. the addition of the poly-A tail to the genomic DNA

Answers

i remember its B !!!!
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