Multiple choice

Which of the following is a set of representative organisms of class Hydrozoa?

  1. Hydra, Obelia and Aurelia

  2. Obelia, Aurelia and Pennatula

  3. Physalia, Aurelia and Pennatula

  4. Obelia, Physalia and Hydra

  5. Hydra, Pelagia and Adamsia

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

Correct answer. Obelia, Physalia and Hydra: All are members of class Hydrazoa of phylumn Coelentrata.