Which type of animal maintains a constant internal body temperature?
endotherm
ectotherm
coelomate
mesoderm

endotherm

Explanation:

Endothermic animals raise body temperature and keep it constant from internal mechanisms, that is, the animal's own metabolism can control its temperature. Ectothermal animals are not able to regulate body temperature with internal mechanisms, so they need external heat sources to raise and maintain their constant body temperature. These animals get heat from the environment (outdoors), usually by exposure to the sun or in contact with hot surfaces such as rocks.

it would lead to upper respiratory infections and pneumonia.

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: