Darwin based his theory of evolution by natural selection on his observations of the

a. genotypes of individuals.
b. phenotypes of individuals.
c. genotypes of populations.
d. phenotypes of populations.

Is this a or d?

2 answers

Darwin wasn't even aware of genotypes.
Why is this the first option for Natural selection causes changes in(1 point)
Responses

populations.
populations.

phenotypes.
phenotypes.

individuals.
individuals.

genotypes.?