Greenhouse gases are best described as .

a.
the result of fossil fuel use
b.
gases that cause the greenhouse effect
c.
carbon dioxide and methane
d.
gases that trap energy from the sun in Earth’s atmosphere

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.