Q: During adulthood, what is needed for the production of sperm? Choices: - steroids - estrogen - androgen - testosterone A:
testosterone

Q: As the prokaryotic cell size increases, what happens to its surface area-to-volume ratio? Choices: - stagnates - halts - increases - decreases A:
decreases

Q: 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:
A: immune system

Question: Q: How many different kinds of ions are produced when sodium chloride dissociates ? Choices: - five - one - three - two A:
Answer: two

*Question*
Q: Electrons are located at fixed distances from the nucleus, what are they called? Choices: - Energy layers - Positive levels - energy concentrations - energy levels A:
**Answer**
energy levels

*Question*
Q: The enormous number of species is due to the tremendous variety of what? Choices: - tissues - sounds - measurements - environments A:
**Answer**
environments