(Question)
Q: What are the gas giants mostly made of . Choices: - calcium and helium - nitrogen and helium - hydrogen and carbon - hydrogen and helium A:
(Answer)
hydrogen and helium

(Question)
Q: Prior to ovulation, ovarian steroid hormones stimulate the uterus to prepare for support of what? Choices: - fertilization - fetus - childbirth - embryo A:
(Answer)
embryo

(Question)
Q: Bone marrow, the thymus gland, the spleen, and the tonsils are organs in what body system? Choices: - skeletal system - nervous system - reproductive system - immune system A:
(Answer)
immune system