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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.

Identify the composition of oceanic and continental crystal rocks. in a model of earth’s interior, where would these rocks appear?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion