Can someone help me please and if you do can you write a paragraph about it Describe the size, color and brightness variations in stars. Explain why there are these differences!

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior