question:
What energy transformation occurs when an electric lamp is turned on?

answer:
electrical energy to light and heat energy

question:
Which best describes two organ systems working together to help maintain homeostasis?

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?

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?

answer:
Use a magnet to separate them.