Q: If the number of trees significantly decreases, the atmosphere's level of which gas might significantly increase? OPTIONS:
- nitrogen
- carbon dioxide
- carbon monoxide
- hydrogen
A: carbon dioxide
In which oceanic zone do clams and crabs survive by burrowing in the sand?
OPTIONS:
- oceanic
- intertidal
- deep ocean
- open ocean

intertidal
Q: A boy pulls a sweater off over his head. His hair is attracted to the sweater due to ---- OPTIONS:
- a magnetic force
- a heat transfer
- a chemical change
- an electrical charge

A: an electrical charge
Which of the following keeps the planets in our solar system in orbit around the Sun?
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OPTIONS:
- atmospheric pressure
- gravitational force
- electromagnetic energy
- thermal energy

gravitational force
Question:
A group of students plans to build a model of a local pond habitat. Which model best represents an environment similar to a pond?
OPTIONS:
- a sealed plastic bottle containing insects and algae from a pond
- a classroom aquarium containing plants and animals bought from a store
- a classroom aquarium containing freshwater, non-native plants, and non-native animals
- a small plastic outdoor pool containing freshwater, native plants, and native animals
Answer:
a small plastic outdoor pool containing freshwater, native plants, and native animals
Q: Comparing the skeletons of which of the following fish would best show the evolution of a fish species? ---- OPTIONS:
- a male fish and a female fish that could produce offspring
- the same fish just before it received a cut and after it healed
- a fish that lived recently and a fish that lived a long time ago
- the same fish just after it hatched and when it was full-grown


A: a fish that lived recently and a fish that lived a long time ago