Q: Why do birds need a light-weight body? Choices: - for cooling - water flotation - food shortages - to stay aloft A:
to stay aloft

Q: What type of respiration has the advantage of releasing more energy? Choices: - kinetic - anaerobic - elastic - aerobic A:
aerobic

Q: Naphthalens is a chemical which is commonly used in what? Choices: - shampoo - fertilizers - inhalers - mothballs A:
mothballs