Animals have adapted different mechanisms for excreting nitrogenous waste products. Which of the following are selective pressures that likely influence which mechanism an animal uses?
I.the amount of water available in the animal's habitat
II.the energy needs of the animal
III.the temperature of the animal's environment
A) only I and III
B) only II and III
C) only I and II
D) I, II, and III

Question

Quizplus · Accepted Answer

The amount of water available (I) and the energy needs of the animal (II) are selective pressures that influence nitrogenous waste excretion mechanisms. Water availability affects whether an animal excretes ammonia, urea, or uric acid, while energy needs influence the metabolic cost of producing these compounds. Temperature (III) is less directly related to nitrogenous waste excretion.

Animals Have Adapted Different Mechanisms for Excreting Nitrogenous Waste Products