Q: What is the radula made mostly of? Choices: - casein - chlorophyll - schist - chitin A:
chitin

Q: An inclined plane is a good example of what kind of machine? Choices: - strong - complex - weak - simple A:
simple

Q: What is the first step of the calvin cycle called? Choices: - dioxide fixation - carbon maturation - breath fixation - carbon fixation A:
carbon fixation

Q: In contrast to mammals and birds, freshwater fishes produce large volumes of very dilute what? Choices: - nitrogen - feces - blood - urine A:
urine