Which of the following is a synonym (word with a similar definition) for the word degradation, used
in line 8 of the passage?
a. health
b. ruin
c. gradation
d. evaluation

 B   ruin

Explanation: Because i looked it up on QUIZLET !

Without variation, there is no difference between members of a population to be "selected for" in the first place. This is a basic tenet of natural selection. A new trait must arise in order to advance or decrease the fitness of the individual, and hence, its ability to pass on its genes.