Question | Answer |
Sponges have little in common with other animals – probably _____ separately from all other animals. | evolved |
Most sponges are symmetrical and _______ | sessile. |
A sponge body is a hollow _____ with one opening at the top & many small pores along the body tube | tube |
Sponges have no tissue, organs, or organ systems; they often do have ______ or ______ for protection & support. | spicules or spongin |
Sponges pull microscopic food particles & oxygen in through their _____; wastes are removed through the opening at the top of the sponge. | pores |
Most sponges are ______ that produce both sperm & eggs, though sponges cannot fertilize their own eggs; sponges can also reproduce asexually by budding or regeneration. | hermaphrodites |
______ are invertebrates that include corals, sea anemones, jelly fish, hydras, & Portugese man-of-wars. | cnidarians |
Most cnidarians live in _____ water; some live as individuals, while others live in colonies. | salt |
Most cnidarians have two body _____ | form |
The polyp is ______-shaped & sessile | vase |
The ______ is bell-shaped & free-swimming | medusa |
Cnidarians have one body opening & ______ symmetry. | radial |
Two cell layers are arranged into ______; a digestive cavity breaks down food. | tissues |
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 & asexually. | produce |
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 provide _______ such as shells, pearls, & chemicals for humans. | resources |