Multiple choice

Which of the following possesses excretory organs?

  1. Diatoms

  2. Algae

  3. Protozoa

  4. Animals

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

Animals have specialized excretory organs such as kidneys in vertebrates, Malpighian tubules in insects, or nephridia in other invertebrates to remove nitrogenous wastes. Protozoa use contractile vacuoles for osmoregulation rather than true excretory organs, while diatoms and algae lack specialized excretory structures.