31. Which of the following is not a strategy used by corals to competing for space? a. Growing taller than other corals
c. Expelling the zooxzanthellae from their own cells
b. Using sweeper tentacles to kill its neighbor d. Using mesenterial filaments to digest their neighbor

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

true skin; another name for the dermis. lies directly beneath the epidermis and is often referred to as the true skin. outermost layer of epidermis, consisting of dead cells.