Jellyfish: Masters of the Ocean

Jellyfish: Masters of the Ocean

Read each question carefully and answer to the best of your ability. Use complete sentences for short answer questions.

Jellyfish are incredible marine animals that have existed for millions of years, even before dinosaurs! They are not actually fish, but are invertebrates belonging to the phylum Cnidaria. Their bodies are mostly made of water, and they lack brains, bones, and hearts. Despite their simple structure, they are successful predators in the ocean.

1. To which phylum do jellyfish belong?

2. Jellyfish are classified as   because they lack a backbone.

3. The primary component of a jellyfish's body is  .

4. Jellyfish have a brain and a heart.

5. Observe the image below. Label the bell and tentacles of the jellyfish.

A:  

B:  

6. Describe how jellyfish move through the water.