Which is an example of commensalism? a. hawks benefit from eating snakes, but they do not benefit the snakes. b. barnacles benefit from living on whales, and they do not hurt the whales. c. birds benefit from living on rhinoceroses, and they benefit the rhinoceroses. d. fleas benefit from living on dogs, but they hurt the dogs.

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.

Need asap plz hurry im being timed when a body cell divides through the process of mitosis, the chromosomes in the daughter cells a. represent only the healthiest chromosomes from the parent cell. b. represent only half of the chromosomes in the parent cell. c. are identical to the chromosomes of the parent cell. d. are formed when chromosomes from the parent cell cross over.

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?