The black walnut tree secretes a chemical from its roots that harms neighboring plants which leaves more light for the black walnut to grow. Which example of species interaction does this represent? A: Predation
B: Parasitism
C: Competition
D: Mutualism

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.

Match the description of each organism to the appropriate category

Which coal field location is related to coal fields in the eastern united states and supports the theory of continental drift? eastern india southern africa western australia northern south america