Q: What guards the opening between the right atrium and the right ventricle? Choices: - superior vena cava - brachiocephalic trunk - aorta - tricuspid valve A:
tricuspid valve

Q: Every human cell has the same what, and each cell has thousands of them? Choices: - chromosomes - DNA - ribosomes - genes A:
genes

Q: Q: What is the process by which plants make their own food? Choices: - glycolysis - metabolism - cellular respiration - photosynthesis A:
A: photosynthesis

Question: Q: What nest of cells protect the egg as it matures in the ovary? Choices: - the tube - the clump - the epidermis - the follicle A:
Answer: the follicle

*Question*
Q: What is responsible for our sense of balance? Choices: - our eyes - our limbs - our feet - our ears A:
**Answer**
our ears

(Question)
Q: One of the most advanced uses of what in medicine is the positron emission tomography scanner, which detects the activity in the body of a very small injection of radioactive glucose? Choices: - radionuclides - quarks - membranes - radioisotopes A:
(Answer)
radioisotopes