Question: Choose your answer.

In the atomic model that includes a nucleus, the positive charge is

OPTIONS:
- spread evenly throughout the model.
- located at multiple sites in the model.
- concentrated in the center of the model.
- positioned outside the center of the model.
My Answer: concentrated in the center of the model.

Question: Choose your answer.

A simple machine that helps move a flag up a flagpole is

OPTIONS:
- a bar magnet
- an inclined plane
- a pulley
- a lever
My Answer: a pulley

Question: Choose your answer.

Which factor will most likely cause a person to develop a fever?

OPTIONS:
- a leg muscle relaxing after exercise
- a bacterial population in the bloodstream
- several viral particles on the skin
- carbohydrates being digested in the stomach
My Answer: a bacterial population in the bloodstream

Question: Choose your answer.

Which event would most likely occur if the number of nitrogen fixing bacteria were reduced within an ecosystem?

OPTIONS:
- plants would have more nitrates to take up
- plants and animals would decompose faster
- high levels of ammonia would accumulate in the soil
- the level of nitrogen gas in the atmosphere would increase
My Answer:
the level of nitrogen gas in the atmosphere would increase