Across
- 4. Sponges have been on Earth for about 540 ______ years. (page 320)
- 6. The bodies of most sponges have irregular ______, with no symmetry. (page 321)
- 7. Sponges live mostly in ___________. (page 320)
- 9. The body of a sponge is something like a bag that is placed all over with openings called ______. (page 321)
- 10. The bowl-shaped _________ (like a jellyfish) is adapted for a free-swimming life. (page 324)
Down
- 1. The soft bodies of most sponges are supported by a network of ______. (page 322)
- 2. Like _________, adult sponges stay in one place. (page 320)
- 3. The Portuguese man-of-war is actually a colony of ________ living together. (picture, page 323)
- 5. A ________, such as a hydra, sea anemone, or coral, is shaped like a vase, with the mouth opening at the top. (page 323)
- 8. A sponge the size of a _________ is able to remove food from 5000 liters of water a day. (page 322)