Are a group of cells with a common structure and function. 2. are usually composed of several types of tissues that together perform a specific task. 3. are groups of several organs that work together to perform the functions of the body. 4. compact, complex animals have specialized internal that provide a large surface area. 5. the protective covering of the body is called the . 6. is the regulation of internal conditions with

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.