question:
Which two factors determine the gravitational attraction between two objects?
OPTIONS:
- time and temperature
- shape and orbital speed
- color and hardness
- mass and distance apart

answer:
mass and distance apart

question:
Which of the following is an example of how insects are beneficial to humans?
OPTIONS:
- Insects can spread diseases.
- Insects have short life spans.
- Insects pollinate flowering plants.
- Insects sometimes eat poisonous plants.

answer:
Insects pollinate flowering plants.

question:
Which process in plants is most similar to sexual reproduction in vertebrates?
OPTIONS:
- cell division
- self-pollination
- cross-pollination
- seed development

answer:
cross-pollination

question:
Currently, Antarctica is the coldest and driest place on Earth. Paleontologists have found dinosaur fossils in rock layers below the ice. Based on this evidence, which is a reasonable conclusion about the climate of Antarctica in the past?
OPTIONS:
- Antarctica has always had the same climate as at present.
- At some time in the past, Antarctica was a hot, dry desert.
- At some time in the past, Antarctica was much warmer and wetter.
- At some time in the past, Antarctica was colder and wetter than it is now.

answer:
At some time in the past, Antarctica was much warmer and wetter.