question:
What energy transformation occurs when an electric lamp is turned on?
OPTIONS:
- electrical energy to light and heat energy
- light energy to electrical and mechanical energy
- heat energy to electrical and light energy
- electrical energy to mechanical and heat energy

answer:
electrical energy to light and heat energy

question:
Which best describes two organ systems working together to help maintain homeostasis?
OPTIONS:
- The reproductive organs produce sex cells.
- The nerves carry signals from the eye to the brain.
- The bones and muscles of the hand work together to grip a pencil.
- The muscles of the chest tighten to push carbon dioxide out of the lungs.

answer:
The muscles of the chest tighten to push carbon dioxide out of the lungs.

question:
A scientist is comparing two body cells of a multicellular organism. Which of the following is most likely identical?
OPTIONS:
- shape of cell walls
- number of mitochondria
- shape of cell membranes
- number of chromosomes

answer:
number of chromosomes

question:
Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles?
OPTIONS:
- Use tweezers to separate them.
- Use a magnet to separate them.
- Add water to the mixture.
- Pour the mixture into a filter.

answer:
Use a magnet to separate them.