Q: What hormone, which is associated with luteinizing hormone and male sexuality, helps bring about physical changes in puberty? A:

OPTIONS:
- steroids
- epinephrine
- estrogen
- testosterone

Answer: testosterone

Q: What is the name of the protein that is found in hairs and nails? A:

OPTIONS:
- cellulose
- chromatin
- Skin
- keratin

Answer: keratin

Q: When a star's core collapses inward while the outer layers spread and cool, what "colorful" celestial body forms? A:

OPTIONS:
- blue giant
- green giant
- white giant
- red giant

Answer: red giant

Q: A muscle can return to its original length when relaxed due to a quality of muscle tissue called what? A:

OPTIONS:
- reach
- viscosity
- moisture
- elasticity

Answer:
elasticity