Multiple choice

Which of the following organisms act as endosymbionts for freshwater sponges?

  1. Methane-eating bacteria

  2. Cyanobacteria

  3. Green algae

  4. Euglena

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

Freshwater sponges host green algae as endosymbionts within archaeocytes and other cells.