Q: Which of the following causes a chemical change?

OPTIONS:
- sugar added to soda
- detergent added to water
- lemon juice added to milk
- salt added to water
A: lemon juice added to milk
Q: A squid is an animal that lives in the ocean. It pumps a stream of water out of its body, causing it to move rapidly. Which of the following mechanical systems moves in a way most similar to the squid?

OPTIONS:
- a bus
- a helicopter
- a rocket
- a train
A: a rocket
Q: Which characteristic is an example of learned behavior?

OPTIONS:
- a bear hibernating in the winter
- a spider spinning a web in a tree
- a butterfly migrating to the south
- a dog scratching at a door to go out
A: a dog scratching at a door to go out
Q: Which is the best tool to measure the angles of a triangular object?

OPTIONS:
- a meter stick
- a compass
- a protractor
- a spring scale
A:
a protractor