Question: Q: What elements do lipids primarily consist of? Choices: - silicon, hydrogen , and oxygen - iron, hydrogen , and oxygen - helium, hydrogen , and oxygen - carbon, hydrogen, and oxygen A:
Answer: carbon, hydrogen, and oxygen

Question: Q: Which part of the body of amphibians, easily absorbs substances from the environment? Choices: - liver - scales - Eyes - skin A:
Answer: skin

Question: Q: Because alkali metals are so reactive, they are found in nature only in ________ with other elements? Choices: - isolation - cooperation - competition - combination A:
Answer:
combination