A

Sapling eaten by> deer eaten by> wolf eaten by> lions

2. Humans hunt deers for antlers.

3. The sapling population will increase.

4. The population of lions will increase.

5. Animals breathe out carbon dioxide which is taken by plants for photosynthesis. During photosynthesis, plants produce oxygen which is breathed in by animals.

C.

Limitation for coal

• Takes hundreds of millions of years to form so it may run out

• Burning it can produce a lot of greenhouse gases

Limitations for sunlight

• High setup cost

• Only available on sunny days making it unreliable

• Relies on environment and weather conditions

• Solar panel takes up space

Limitations for wind

• Relies on environment and weather conditions making it unreliable

• Maintenance cost is high

• Wind turbine takes up a lot of space

• Wind turbines are usually far from cities, therefore require more energy and higher cost to transport the energy to cities