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What is one way human beings have disrupted the sulfur cycle?
A. combustion of fossil fuels
B. deforestation
C. mining processes
D. use of fertilizers

Compare the composition of the moon's surface with the composition of the earth's surface.

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.

Which event would lead to primary succession of a forest?