Question | Answer |
Sponges have little in common with other animals- probably ______ separately from all other animals | evolved |
Most sponges are asymmetrical and _____ | Sessile |
A sponge body is a hollow ____ with one opening at the top and many small pores along the body tube | tube |
Sponges have no tissues, organs, or organ systems; they often do have ____ or ____ for protection and support | Sticules
Spongin |
Sponges pull microscopic food particles and oxygen in through their ___; wastes are removed through the opening at the top of the sponge | pores |
Most sponges are _______ that produce both sperm and eggs, though sponges cannot fertilize their own eggs; sponges can also produce asexually by budding or regeneration | hermaphrodites |
_______ are invertebrates that include corals, sea anemones, jellyfish, hydras, and Portuguese man-of-wars | Cnidarians |
Most cnidarians live in ____ water; some live as individuals, while others live in colonies | salt |
Most cnidarians have two body _____ | forms |
The POLYP is ____-shaped and sessile | vase |
The ______ is bell-shaped and free-swimming | MEDUSA |
Cnidarians have one body opening and ______ symmetry | radial |
Two cell layers are arranged into ______; a digestive cavity breaks down food | tissue |
A _____ net carries impulses and connects all organism parts | nerve |
Most cnidarians have _________ with stinging cells to help capture food | tentacles |
Cnidarians are _________ | predators |
Cnidarians ________ both sexually and asexually | reproduce |
Cnidarians have existed more than 600 million years; most of their fossils are ______ | corals |
Coral reefs form as corals secrete their hard external _________ on those of earlier generations | skeletons |
Coral Reefs are _______ ecosystems that protect shorelines from erosion | diverse |
Coral Reefs provide _________ such as shells, pearls, and chemicals for human medical uses | resources |