Choose the correct words or phrases to complete the following description of evolution.
Evolution occurs when the frequencies of _____, genes change within a population _______, In order for evolution by natural selection to occur, which conditions do not have to be met?
a. Some traits confer a survival and reproductive advantage.
b. Traits are heritable.
c. Only the physically strongest individuals survive.
d. Genetic variability exists within a population.
e. Imagine that you are planting a garden, and you have