Q: The fur color of a bear varies with its environment. Polar bears found in the Arctic have white fur, while black bears found in Pennsylvania have dark fur. Which best describes the variation of fur color amongst the bear species?

OPTIONS:
- modified characteristic
- ecological succession
- structural adaptation
- selective breeding
A: structural adaptation
Q: When a person chews, saliva from the mouth mixes with starches in food. These starches begin to turn into sugars. Changing starches into sugars is best described as

OPTIONS:
- a phase change.
- a cellular change.
- a physical change.
- a chemical change.
A: a chemical change.
Q: Which is a major organ of the nervous system?

OPTIONS:
- brain
- stomach
- lung
- bone
A: brain
Q: At night, the Moon is the brightest object in the sky. Where does the Moon's light come from?

OPTIONS:
- The Moon reflects light from Earth.
- The Moon reflects light from the Sun.
- The Moon makes light beneath its surface.
- The Moon has rocks on its surface that glow.
A:
The Moon reflects light from the Sun.