question:
Which human organ system exchanges gases with the environment?
OPTIONS:
- endocrine
- circulatory
- respiratory
- integumentary

answer:
respiratory

question:
Which is an example of a chemical reaction?
OPTIONS:
- The melting of ice
- The grinding of salt crystals to powder
- The burning of wood
- The evaporation of water from a puddle

answer:
The burning of wood

question:
The best evidence that two land areas were once connected is the discovery that both land masses
OPTIONS:
- have the same climate.
- are in the same stage of succession.
- exist along the same line of longitude.
- have similar types of rocks and fossils.

answer:
have similar types of rocks and fossils.

question:
A boy pulls a sweater off over his head. His hair is attracted to the sweater due to
OPTIONS:
- a magnetic force
- a heat transfer
- a chemical change
- an electrical charge

answer:

an electrical charge