Q: Q: Each pollen grain has two coverings: the exine (thicker, outer layer) and the what? Choices: - tube nucleus - pollen tube - cytoplasm - intine A:
A: intine

Q: Q: A salt concentration of 32 percent is nearly ten times that of what abundant resource? Choices: - oxygen - fresh water - algae - seawater A:
A: seawater

Q: Q: Hemolymph bathes organs directly in arthropods and most molluscs, due to an open type of what system? Choices: - nervous - pulmonary - reproductive - circulatory A:
A: circulatory

Q: Q: The major classes of living members of this phylum include gastropods, bivalves, and cephalopods? Choices: - insects - crustaceans - invertebrates - mollusks A:
A: mollusks