Q: Answer the question

Which cell can survive without the help of other cells?
OPTIONS:
- leaf cell
- yeast cell
- onion cell
- muscle cell

A: yeast cell

Q: Answer the question

Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is
OPTIONS:
- balance.
- friction.
- gravity.
- size.

A: friction.

Q: Answer the question

Most stars are similar to each other in
OPTIONS:
- brightness.
- composition.
- diameter.
- temperature.

A:
composition.