A dichotomous key is two paired sentences that have contrasting characteristics. That's all i know
I think it’s the first one parasitism...
Answer: A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys consist of a series of choices that lead the user to the correct name of a given item.
Explanation: google
Progesterone and estrogens are thought responsible for the release (and prevention of release) of an egg during ovulation
