Q: Most people can survive only a few days without what essential substance? Choices: - air - food - carbon - water A:
water

Q: Which are the closest living relations to land plants? Choices: - mammals - arthropods - sporozoans - charophytes A:
charophytes

Q: Particulates cause lung diseases. they can also increase the risk of heart disease and the number of what? Choices: - coughing - cancer - shortness of breath - asthma attacks A:
asthma attacks

Q: The sticky stigma at the tip of the carpel receives what? Choices: - bacteria - salt - nitrogen - pollen A:
pollen