In central america there is a tree called bullhorn acacia (acacia cornigera) that provides both food and shelter to a certain species of ant (pseudomyrmex ferruginea). the ants live within the tree without causing it harm. in fact, the ants protect the tree by vigorously attacking and stinging other animals that try to eat it. this relationship is an example of —

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Which entry is in the wrong position in the table?

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.