Q: What are the two main types of sedimentary rocks? Choices: - sandstone and shale - shale and limestone - basalt and dolomite - clastic and chemical A:
clastic and chemical

Q: Although they look like big rocks, what structures that serve as habitats for many different types of ocean life are actually alive? Choices: - new forming reefs - natural reefs - southern reefs - coral reefs A:
coral reefs

Q: In a model of a hemoglobin molecule, the purple part indicates the presence of what element? Choices: - gold - helium - silver - iron A:
iron