Multiple choice

The life cycle of which of the following has medusa?

  1. Hydra

  2. Starfish

  3. Obelia

  4. Both (1) and (3)

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

Obelia exhibits an alternation of generations (metagenesis) between the polyp stage and the medusa stage. Hydra exists only in the polyp form.