In responding to the force of gravity, which characteristic is present in many land animals?

A. They rely on soft tissues to maintain their shape

B. They must be able to move quickly

C. They have a rigid musculoskeletal system

D. They have wings and flippers

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.

The science for classifying and naming organisms is known as

What form of anesthetic was used for field surgery