An adaptation is a change that

a. makes a species prettier to look at
b. makes a species become extinct
c. a species survive
d. prevents a species from surviving

The correct answer for the blank is- C. helps a species survive.

Adaptation can be described as process of change in a living organism according to which the organism becomes better suited to the environmental conditions, leading to increase in the chances of survival and reproduction.

According to Natural selection, an evolutionary theory given by Charle's Darwin, organism that can better adapt in the changing environmental conditions survive and increase their number through reproduction, whereas organisms that can not adapt are eliminated from the population eventually.

Thus, option C) is the right answer.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides