Apopulation of elephants becomes too large, and several members leave the population. what is this process called?
death rate
immigration
emigration
births

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

In the diagram below, the northern hemisphere would be in what season at position a a. fall b. winter c. summer d. spring

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.