Multiple choice

Which of the following animals relies on maintaining a constant water flow through its body to obtain food and oxygen, and to remove wastes?

  1. Hydra

  2. Spongilla

  3. Starfish

  4. Earthworm

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Spongilla is a genus of freshwater sponge. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them