A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of a. hybridization. b. incomplete dominance. c. true-breeding. d. the law of segregation. e. polygenetics.

Explanation:

A true breeding: it  is a kind of breeding in which the parents would produce offspring that all the offspring  would contain the same phenotype.

This means that the parents are homozygous for each trait. So their all the offspring will be same as the parent.

So here a plant with purple flowers is allowed to self-pollinate, as generation after generation it produces purple flower, it means that it must be homozygous for purple color.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

the correct answer is - ability to find a mate