Question:
What two gases make up most of the Earth's atmosphere?
OPTIONS:
- Hydrogen and oxygen
- Hydrogen and nitrogen
- Oxygen and carbon dioxide
- Oxygen and nitrogen
Answer:
Oxygen and nitrogen
Question:
Food webs show feeding relationships among different types of organisms. Those organisms each have a specific niche. Which of the following best describes a function of decomposers in food webs?
OPTIONS:
- to recycle nutrients into soil
- to convert solar energy into food
- to provide food for secondary consumers
- to compete with secondary consumers for oxygen
Answer:
to recycle nutrients into soil
Question:
If a species is no longer able to reproduce, it will
OPTIONS:
- adapt to its environment
- become immune to disease
- become extinct
- increase its population
Answer:
become extinct
Question:
Heat transfer is part of everyday life. Which of these examples involving heat transfer occurs mainly by conduction?
OPTIONS:
- The sun warms the ground.
- A hot oven warms a cold kitchen.
- A campfire warms a person's hands.
- Hot soup warms a metal spoon handle.
Answer:

Hot soup warms a metal spoon handle.