Which of the Following is (Are)unique to Animals

Question

Which of the following is (are)unique to animals?
A) cells that have mitochondria
B) the structural carbohydrate, chitin
C) nervous conduction and muscular movement
D) heterotrophy
E) Two of these responses are correct.

Accepted Answer

Nervous conduction and muscular movement are unique to animals and are essential for their mobility and behavior. Choice A is incorrect because cells with mitochondria are found in both animal and plant cells. Choice B is incorrect because chitin is also found in fungi, and choice D is incorrect because heterotrophy is not unique to animals; many other organisms, such as fungi and some bacteria, are also heterotrophic.