Q: Fish and other aquatic organisms use gills to capture dissolved what? Choices: - food - sulfur - nitrogen - oxygen A:
oxygen

Q: How does water from roots reach the leaves? Choices: - water - combining cells - water - raising cells - water-phobic cells - water-conducting cells A:
water-conducting cells

Q: Which organ is the control center of the nervous system? Choices: - the heart - the spine - the lungs - the brain A:
the brain

Q: When carbon atoms are not bonded to as many hydrogen atoms as possible, what kind of hydrocarbon results? Choices: - unstable - aqueous - saturated - unsaturated A:
unsaturated