The example of giraffes growing longer necks to reach leaves on higher branches illustrates .a. natural selection b. migration c. genetic drift

A. Natural selection

Explanation:

Natural selection is a mechanism of differential survival and reproduction of the members of the population of a species those have better traits. These traits help them to adapt, survive and reproduce in adverse environment.

Giraffe growing long neck is the example of natural selection. The long neck is the phenotypic adaptation which develop in order to fetch leaves from branches of long trees in the scarcity of grass and small plants in the ground.

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.