Q: Hormones often regulate what through antagonistic functions? Choices: - hypothesis - consciousness - breathing - homeostasis A:
homeostasis

Q: Earth is the only planet in the solar system that has what element, which is essential for human life, present in all three of its states? Choices: - helium - oxygen - carbon - water A:
water

Q: Q: What helps form the walls of internal organs such as the heart and stomach? Choices: - blood - tissues - valves - muscles A:
A: muscles

Question: Q: What mammalian structure allows the exchange of gases, nutrients, and other substances between the fetus and mother? Choices: - uterus - mitochondria - notochord - placenta A:
Answer: placenta

*Question*
Q: Coronary heart disease is caused when what blocks coronary arteries? Choices: - proteins - carbohydrates - fats - plaque A:
**Answer**
plaque

Q: Q: What is the term for a resource that is used in a way that meets the needs of the present without keeping future generations from meeting their needs? Choices: - tolerable - innovative - structural - sustainable A:
A: sustainable