Question | Answer |
Sponges have little in common with other animals. They have probably __________ separately. | Evolved |
Most sponges are Asymmetrical and ________. | Sessile |
A sponge is a hollow _________ with an opening at the top and many small pores along the body tube. | Tube |
Sponges have no organs or tissues so they use what two things for protection? | Spicules and Spongin |
Where is water pulled into the sponge and blown out the main opening? What are the small holes called? | Pores |
Most sponges can produce both sperm and eggs meaning they are what? | Hermaphrodite |
__________ are invertebrates that include corals, sea anemones, jellyfish, hydras, and the Portuguese Man of War. | Cnidarians |
Most cnidarians live in what type of water? | Salt Water |
Most cnidarians have two body _________. | Forms |
The polyp is ________ shaped and sessile. | Vase |
The ________ is bell shaped and free-moving. | Medusa |
What symmetry do cnidarians have? | Radial |
Two cell layers are arranged into _________; a digestive cavity breaks down food. | layers |
A _________ net carries impulses and connects all organisms organs. | Nerve |
Most cnidarians have ________ and stinging cells to help them catch food. | Tentacles |
Are cnidarians herbivores or carnivores? | Carnivores |
Cnidarians __________ both sexually and asexually. | Reproduce |
Cnidarians have existed for more than 600 million years; most of their fossils are _________. | Corals |
Coral reefs form as they secrete their hard external__________ on those of earlier generations. | Skeletons |
Coral reefs are ___________ ecosystems that protect costs from erosion. | Diverse |
Coral reefs provide many things that humans need, these things are called___________. | Resources |