The picture shows several hot-air balloons floating near a river at the Albuquerque International Balloon Fiesta. Everything you see in the picture is made of matter! List at least three different elements or
compounds that you observe in the photo, describe a property of each, and compare them to each other.

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.