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Wich organism obtains its energy from dead or decaying matter

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.

What is a general feature of a species that varies from one individual to the next (skin tone, eye color or hair color)? a. organism b. trait c. character