During the process of demographic transition, why does the total population continue to grow if the natural increase
rate iS moderating?
O The crude birthrate stabilizes while the crude death rate declines.
• The crude birthrate remains higher than the crude death rate.
O The crude birthrate declines faster than the crude death rate.
• Economic changes stabilize the crude death rate.
• Economic changes stabilize the crude birthrate.

The value of x in the triangle given 11 and 31 degrees is 138 degrees.

A triangle is a three-sided polygon with three edges and three vertices in geometry. The sum of a triangle's internal angles equals 180 degrees, which is its most important property. This is known as the angle sum property of a triangle.

The triangle's properties are as follows: The sum of all triangle angles (of all types) equals 180°. The sum of the lengths of a triangle's two sides is greater than the length of the third side. Similarly, the length of the third side is less than the difference between the two sides of a triangle.

Therefore, the triangle will be illustrated thus:

x + 11 + 31 = 180

x + 42 = 180

x = 180° - 42°

x = 138°

Therefore, x is 138°.

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Marlene Zuk and colleagues hypothesize that the Kauai population has evolved to be less choosy than other populations because of the high frequency of mute .

Natural selection can alter the frequency of various learning rules across generations, but learning can alter behaviour within a generation. Through learning, past events can change a person's behaviour over the course of their lifetime. Natural selection and learning are independent processes.

An individual's allele frequencies alter according to natural selection. -Natural selection affects an organism population's genetic diversity. - Traits that differ as a result of natural selection can either promote or decrease survival and reproduction.

There must be heritable variation in phenotypes and the variation in phenotype must be linked to differential survival and/or reproduction, or differential fitness, for natural selection to take place. The conclusion is that any organisms with heritable variation in reproduction rates are capable of evolving.

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An energy efficiency improvement is replacing incandescent bulbs with LEDs.

Compared to LEDs, incandescent bulbs are less expensive. Despite LED's rising popularity over time, they are also more widely accessible. But LED is praised for having a long lifespan, being energy-efficient, and requiring less upkeep. Up to 50,000 to 100,000 operating hours, or around five to ten years, can be obtained from an LED light. As it wastes less energy by creating little heat, it is more energy-efficient than an incandescent. In addition, LED emits light in a specific direction rather than in a 360-degree circle as incandescent does; this conserves energy since it concentrates on a certain angle rather than requiring more energy for the entire 360 degrees. Despite being more expensive initially, LED also outperforms other lighting types in terms of maintenance expenses.

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A tornado's core is characterized by low pressure, which is typically 10–20% lower than the atmospheric pressure around it.

When air descends from a great height into a place, the pressure in that area rises, which causes the wind to blow outward. At the surface, there is a high pressure area.

A low pressure area is the opposite, when surface air is moving upward and drawing air inward along the surface.

Since the air is less dense at a height, little water can be held there. When that air is forced downward, it gets heated and compressed, which allows it to take in a lot more moisture. As a result, high pressure areas are usually clear and dry.

In contrast, the air close to the ground is warmer and denser (compared with high altitude air). The hot, humid air expands as it climbs, becoming less dense and cooling.

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Except for Antarctica, every continent has native bees. Bees are present wherever there are flowering plants that are pollinated by insects, including in forests, farms, towns, and rural areas.

Bees are winged insects related to ants, wasps, and beetles. They are most known for their pollination abilities and, in the case of the western honey bee, for making honey. Within the superfamily Apoidea, the monophyletic lineage of bees can be found. Currently, they are regarded as belonging to the clade Anthophila. Bees are classified into seven recognized biological families and over 16,000 different species. Most species (>90%) are solitary, including mason bees, carpenter bees, leafcutter bees, and sweat bees. Some species, such as honey bees, bumblebees, and stingless bees, live socially in colonies. There are bees in every ecosystem on the earth that supports insect-pollinated blooming plants, with the exception of Antarctica. The Halictidae, or sweat bees, are the most prevalent bees in the Northern Hemisphere, yet due to their small size, people frequently mistake them for wasps or flies. Bees come in a variety of sizes, from tiny stingless bee species with workers that are less than 2 millimetres (0.08 in) long to the largest species of leafcutter bee, Megachile pluto, with females that may grow as long as 39 millimetres (1.54 in). Bees consume pollen and nectar, the latter for its protein and other nutrients and the former largely as an energy source. Most pollen is consumed by their larvae as nourishment. Primates and bee-eating birds are examples of vertebrate bee predators, whereas beewolves and dragonflies are examples of insect predators.

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Principle of Superposition, states that in an undisturbed sedimentary sequence, the older beds are on the bottom, and the younger beds are on the top.

The law of superposition is a saying that forms one of the bases of the sciences of geography, prehistoric studies, and different fields relating to geographical stratigraphy. In its plainest structure, it states that in undeformed stratigraphic sequences, the oldest strata will lie at the lower part of the sequence, while fresher material stacks upon the surface to shape new deposits over the long haul. This is principal to stratigraphic dating, which requires a set of assumptions, including that the law of superposition holds valid and that an article can't be more established than the materials of which it is composed. To illustrate the useful applications of superposition in scientific request, sedimentary rock that has not been disfigured by more than 90° will show the oldest layers on the base, thus empowering paleontologists and paleobotanists to recognize the overall ages of any fossils tracked down inside the strata, with the remains of the most old lifeforms restricted to the lowest. These findings can illuminate the local area on the fossil record covering the important strata, to figure out which species coexisted transiently and which species existed successively in perhaps a developmentally or phylogenetically significant way.

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A lahar is a volcanic mudflow that resembles fluid concrete.

Lahars are a particularly ferocious variety of mudflow or debris flow made up of a slurry of pyroclastic material, stony debris, and water. Usually in a river valley, the material descended from the volcano. Lahars may flow at speeds of up to 10 meters per second, can reach depths of up to 140 meters, and tend to demolish any buildings that are in their way.

Stream flows can be regular, hyper-concentrated (sediment concentration between 30 and 60%), or debris-filled (sediment concentration greater than 60%) during lahars. Indeed, because to variations in the supply of sediment and water, a lahar's rheology and subsequent behavior can fluctuate across time and space within a single occurrence.

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