2. Is an animal a protostome or a deuterostome if the first opening becomes the

Question

2. Is an animal a protostome or a deuterostome if the first opening becomes the mouth? 3. What do all molluscs have in addition to a muscular foot and a mantle? 4. What characteristic does an animal with a definite head region have? 5. What organ is found inside the pericardial sac (pericardium)? 6. What kind of skeleton do annelids have? 7. To what system do the crop and gizzard of an earthworm belong? 8. What is the location of the nerve cord in an earthworm? 9. What phylum of animals have chitinous exoskeletons? 10. What are the excretory structures in a crayfish clld? 12. Wht ystem of tf echinoderms enables them to move abour? 11. How is air taken directly to the muscles in a grasshopper? 13. What kind of symmetry does an adult starfish have? 14. Where does water enter the water vascular system in a starfish?

Explanation / Answer

2. Prostome is differentiated into first mouth.

3. Visceral mass is also an essential feature if molluscs.

4. Acoelmates have definate head.

5. Heart is enclosed in pericardium sac.

6. Annelids have hydrostatic skeletons.

7. Crop and gizzard are the part of digestive system of earthworm.

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