5. The burning of which fossil fuel accounts for 1/3 of the electricity in the US and emits 68% of the carbon dioxide released this way? Choose the correct answer from below.

Question

a. natural gas
b. coal
c. oil

6. What is the definition of respiration? Choose the correct answer from below
a. The process by which animals maintain body temperature
b. The process by which organisms obtain energy by taking in oxygen and releasing carbon dioxide
c. The process by which dead plants breakdown and return carbon to the soil
d. When greenhouse gases trap heat in earth's atmospere

Answer 1

For question 5, the correct answer is b. coal.

For question 6, the correct answer is b. The process by which organisms obtain energy by taking in oxygen and releasing carbon dioxide.