Scientists measured and recorded the average body size in a bird population over time. One year, a period of cold weather killed many of the birds. A few generations later, the scientists observed that the average body size in the population was larger than it had been before the cold weather. The scientists concluded that the population had evolved through natural selection. Which of the following would provide the best evidence to support the scientists conclusion?

EVOLUTION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Scientists measured and recorded the average body size in a bird population over time. One year, a period of cold weather killed many of the birds. A few generations later, the scientists observed that the average body size in the population was larger than it had been before the cold weather. The scientists concluded that the population had evolved through natural selection. Which of the following would provide the best evidence to support the scientists’ conclusion?

A	the frequency of alleles for body size changed in the bird population
B	the number of birds in the population had decreased by 50% or more
C	the birds with the largest body size were the males
D	the size of the bird eggs also increased over time

Explanation:

Detailed explanation-1: -One year, a period of cold weather killed many of the birds. A few generations later, the scientists observed that the average body size in the population was larger than it had been before the cold weather. The scientists concluded that the population had evolved through natural selection.

Detailed explanation-2: -For example, hummingbird hawk moths (a type of insect) strongly resemble hummingbirds and have wings that allow them to hover while collecting nectar from flowers. While both species are distinct, their wings shapes converged on a similar evolutionary trajectory.

Detailed explanation-3: -A good example of this is gliding frogs, which have evolved in parallel from the different kinds of tree frogs. The repeated development of the C4 photosynthesis, dispersal of seeds by the fleshy fruits, which are adapted to be consumed by animals, are instances of convergent evolution in plants.

Detailed explanation-4: -One of the most dramatic examples of convergent evolution is seen in photosynthesis-the process that plants use to capture energy from the sun and convert carbon dioxide and water into carbohydrates and oxygen.

There is 1 question to complete.

LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

EVOLUTION