Question: Choose your answer.

In the past, wild hogs called "javelinas" were seen only in the southern part of New Mexico. Now, javelinas are seen in areas 100 miles further north. What is the most likely cause of this expansion?

OPTIONS:
- Javelinas are reproducing less frequently.
- Environmental conditions have changed.
- The javelina's genetic traits have mutated.
- Nutritional requirements of javelinas have changed.
My Answer: Environmental conditions have changed.

Question: Choose your answer.

All natural resources on Earth are either renewable or nonrenewable. Whether a resource is renewable or nonrenewable depends on how fast or slow the resource is replaced. If the resource is used faster than it is replaced, then the resource will, in time, disappear. Which statement describes the use of a renewable natural resource?

OPTIONS:
- A home burns natural gas for heat.
- A city burns coal to generate electricity.
- A farmer plants different types of crops to protect the soil.
- A construction crew builds a road from rock, sand, and gravel.
My Answer: A farmer plants different types of crops to protect the soil.

Question: Choose your answer.

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.
My Answer: a chemical change.

Question: Choose your answer.

What is the smallest structural and functional unit of the nervous system?

OPTIONS:
- brain
- organ
- neuron
- spinal cord
My Answer:
neuron