Q: Osteoclasts break down bone to maintain mineral what? Choices: - density - fluctuations - polarity - homeostatis A:
homeostatis

Q: Are the lungs organs of the excretory system, the respiratory system, or both? Choices: - excretory - respiratory - neither - both A:
both

Q: Q: What supports life, and is also needed for the water cycle and weather? Choices: - fossil fuels - oxygen - greenhouse gas - atmosphere A:
A: atmosphere

Question: Q: Where does fertilization usually take place? Choices: - uterus - ovary - vagina - fallopian tubes A:
Answer: fallopian tubes

*Question*
Q: What zone is outside the radiative zone? Choices: - diffusion zone - activation zone - peripheral zone - convection zone A:
**Answer**
convection zone

(Question)
Q: Sepals, petals, pistils, and stamens are contained in all what, which are actually modified leaves or sporophylls organized around a central stalk? Choices: - chlorophyll - roots - stems - flowers A:
(Answer)
flowers