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.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint