All Animals are ____

Question

All animals are ____.  
A) multicellular, heterotrophic, and motile
B) multicellular, heterotrophic, and have walled cells
C) unicellular, autotrophic, and motile
D) multicellular, autotrophic, and reproduce sexually
E) unicellular, autotrophic, and reproduce asexually

Accepted Answer

This is the classic definition of animals. They are multicellular, meaning they have more than one cell; heterotrophic, meaning they must consume other organisms for sustenance; and motile, meaning they can move on their own. Option B is incorrect because not all animals have walled cells (e.g. blood cells). Option C is incorrect because autotrophic organisms produce their own food, whereas animals are heterotrophic. Option D is incorrect because not all animals are autotrophic and reproduce sexually. Option E is incorrect because not all animals are unicellular and autotrophic.