Question: Choose your answer.

Fossil records indicate that Earth was first inhabited by bacteria-like organisms. These organisms

OPTIONS:
- were single-celled.
- had organ systems.
- were multi-cellular.
- had small appendages.
My Answer: were single-celled.

Question: Choose your answer.

Plumes of water vapor have been observed rising from the southern polar region of Enceladus, one of the moons of Saturn. A team of scientists proposed an explanation for the plumes and developed a model. They also published calculations based on their model. These calculations would most likely be used for which purpose in future research?

OPTIONS:
- testing the hypothesis
- evaluating similar events
- mapping routes for exploration
- checking the validity of observations
My Answer: evaluating similar events

Question: Choose your answer.

One key physical process in beach formation is wave action. Sand is deposited on beaches as waves break onto the shoreline and the energy from the wave scatters. Which type of energy is most used by wave action to modify the shape of the beaches?

OPTIONS:
- thermal
- potential
- chemical
- mechanical
My Answer: mechanical

Question: Choose your answer.

Which pair together could cause a rainbow?

OPTIONS:
- Fog and clouds
- Rain and snow
- Clouds and ice
- Sunshine and rain
My Answer:
Sunshine and rain