Question

Which of the following statements is true?

Thermal pollution is the main disadvantage of hydroelectric power.
The total amount of water in an ecosystem is always increasing.
Wood and water are nonrenewable natural resources.
The greenhouse effect is primarily caused by cars and trucks.

Answer 1

I think it’s d “The greenhouse effect is primarily caused by cars and trucks.”

Step-by-step explanation:

Thermal pollution is the main disadvantage of hydroelectric power.

The total amount of water in an ecosystem is always increasing.

Wood and water are nonrenewable natural resources.

The greenhouse effect is primarily caused by cars and trucks.

Answer 2

I think it’s d “The greenhouse effect is primarily caused by cars and trucks.”