Q: The net effect of aldosterone is to conserve and increase water levels in the plasma by reducing the excretion of what element, and thus water? Choices: - oxygen - potassium - lithium - sodium A:
sodium

Q: What is the main source of hydrocarbons? Choices: - photosynthesis - greenhouse gases - decomposers - fossil fuels A:
fossil fuels

Q: When blood vessels in the head dilate, what kind of severe headache can occur? Choices: - malignant - chronic headache - tension headache - migraine A:
migraine

Q: Chemistry is the study of matter and energy and how they what? Choices: - distinct - division - interaction - interact A:
interact