Multiple choice

Which of the following sponges closely resemble the sea anemones?

  1. Demosponge

  2. Hexactinellids

  3. Octocorallia

  4. Hexacorallia

  5. Cerianthids

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

Cerianthids look very similar to sea anemones. They are solitary, living buried in soft sediments. Tube anemones live and can withdraw into tubes, which are made of a fibrous material, which is made from secreted mucus and threads of nematocyst-like organelles, known as ptychocysts.