Q: Thousands of years ago, several species of large mammals existed in North America. These species became extinct not long after the first human settlement of North America. Which human activity most likely contributed to the extinction of these mammals?

OPTIONS:
- hunting
- waterway pollution
- habitat destruction
- competition for resources
A: hunting
Q: Which could be a possible way to prevent wildlife species from becoming endangered?

OPTIONS:
- drinking less water
- establishing more habitats
- cutting down more forests
- stopping underground coal mining
A: establishing more habitats
Q: Most underground caves are formed by the action of water on

OPTIONS:
- granite
- limestone
- sandstone
- shale
A: limestone
Q: Why is protein an important part of a healthy diet?

OPTIONS:
- It is needed to change glucose to energy.
- It is needed to store nutrients.
- It is needed to repair tissue.
- It is needed to produce water.
A:
It is needed to repair tissue.