Is a process by which organisms with characteristics suited to the environment will survive and reproduce.

The question is asking us to fill in the gap in the following phrase: (gap) is a process by which organisms with characteristics suited to the environment will survive and reproduce. The keyword here is "suited to the environment" - this suggests that other organisms will not survive and reproduce. This is known in biology as "natural selection" - also known as "survival of the fittest"

Genetic engineering is the answer.

In the air and in the lower fre ah water