Q: What are muscle cells in the muscles called? Choices: - human fibers - use fibers - job fibers - muscle fibers A:
muscle fibers

Q: What term refers to a change in species over time? Choices: - spontaneous change - generation - mutation - evolution A:
evolution

Q: Q: What is a form of mechanical energy that starts with a vibration in matter? Choices: - solar energy - electrical energy - industrial energy - sound energy A:
A: sound energy

Question: Q: What chemical affects the onset of puberty and duration? Choices: - steroids - enzymes - acids - hormones A:
Answer: hormones

*Question*
Q: Each microspore develops into a pollen grain containing a male what? Choices: - progesterone - zygote - sperm - gametophyte A:
**Answer**
gametophyte

Q: What hormone, which is associated with luteinizing hormone and male sexuality, helps bring about physical changes in puberty? Choices: - steroids - epinephrine - estrogen - testosterone A:
testosterone