Question

select the correct answer.
tortoises with long necks were found to be abundant in regions that had vegetation on a higher level. a few years later, drought hit the region and the vegetation dried up. over time, grasses were observed in the region. shortly thereafter, an increase in short - necked tortoises was observed in the region. what does this change in the species of tortoises suggest?
a. changes in the environment give rise to evolution of species.
b. tortoises all around the world are now short necked.
c. tortoises found only in this region are short necked.
d. only changes in food availability affect the evolution of species.

Explanation:

The question is about the evolution of tortoises in response to environmental changes (vegetation drying up and then drought). Evolution is a key concept in biology. The idea that changes in the environment (like food availability changes due to vegetation levels) can drive the evolution of species (tortoises here) is a fundamental biological principle.

Answer:

A. Changes in the environment give rise to evolution of species.