Which pair is at the same level of structural organization? a) p and w b) q and z c) r and y d) s and x

5) these are organisms where the genetic material is not bound by a nucleus. they are usually unicellular.

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.

9. the history of life on earth is recorded in