Q: Cellular respiration and photosynthesis are important parts of which cycle? A:
OPTIONS:
- vapor cycle
- greenhouse effect
- water cycle
- carbon cycle
carbon cycle

Q: What happens to the total energy of the system when heat is positive? A:
OPTIONS:
- nothing
- it remains constant
- it decreases
- it increases

Answer: it increases

Question: Q: Anabolic steroids, a form of the male sex hormone testosterone, are one of the most widely known performance-enhancing drugs. steroids are used to help build what? A:
OPTIONS:
- bone mass
- nervous tissue
- brain tissue
- muscle mass
Answer: muscle mass

input with options: Q: What is the term for the basic contractile unit of the muscle? A:
OPTIONS:
- filament
- sphincter
- bandimere
- sarcomere
output: sarcomere

Q: Q: What energy, produced by vibrations, cannot travel through empty space? A:

OPTIONS:
- light
- heat
- plasma
- sound

A: sound

Q: The combined gradient that affects an ion includes its concentration gradient and its what? A:
OPTIONS:
- radiation gradient
- cell membrane
- electron bond
- electrical gradient
electrical gradient