Which symbiotic relationship do you think would have the greatest impact on the size of a population?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Matched chromosomes carrying information about the same characteristics in the organism are called

How do the sperm cells get from the stigma to the ovules?