Question

zoology reviewporifera, cnidaria1. many cnidarians have two distinct life stages called:2. because sponges stay in one place all their lives and feed off of food particle in the water, they are considered3. nematocysts do what?4. what is the function of collar cells in porifera?7. what is the function of amoebocytes in porifera?8. the cnidarians inner layer of tissue is specialized for:9. the outer cell layer of a cnidarian is called the:11. what characteristics are associated only with cnidarians?12. scyphozoans spend most of their lives in this stage13. the class of cnidarians that typically live only as polyps is the15. which cnidarian sensory structure is specialized to detect gravity?16. cnidarians are diploblastic, meaning they have what?17. cnidarians that typically build a skeleton of calcium carbonate belong to the class known as the18. cnidarians are dimorphic, meaning they have20. the formation of a true head region where the sensory organs are located is known as;22. sponges have sharp structures that protect and support their bodies called;23. corals exist in a symbiotic relationship with24. a hydra exhibits what kind of symmetry?

Explanation:

Answer:

1. Polyp and medusa
2. Sessile filter feeders
3. Inject venom/stinging structures to capture prey
4. They create water currents and trap/ingest food particles
5. They transport nutrients, digest food, and produce skeletal structures
6. Digestion (and nutrient absorption)
7. Epidermis
8. Nematocysts (stinging cells) and radial symmetry with two tissue layers
9. Medusa stage
10. Anthozoa
11. Statocyst
12. Two embryonic germ layers: the ectoderm and endoderm
13. Anthozoa
14. Two distinct body forms (polyp and medusa)
15. Cephalization
16. Spicules
17. Zooxanthellae (photosynthetic dinoflagellates)
18. Radial symmetry