If you look at the Periodic Table of Elements, you will noticed that the elements are arranged into groups. Why are these elements grouped? What qualities do the elements in these groups share? Describe at least one group in detail in your explanation.

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.