Question

fossil fuels __.
a are the remains of once-living organisms.
b include coal, oil, and natural gas.
c increase the amount of carbon dioxide in the atmosphere when burned.
d are significant contributors to global warming.
e all of these.
question 47
which human activities contribute to elevated carbon dioxide levels in the atmosphere?
a driving gasoline-powered cars
b burning of coal
c burning of oil
d burning of forests

Explanation:

For the first question: Fossil fuels are derived from once-living organisms (A), include coal, oil, natural gas (B), release CO₂ when burned (C), and contribute to global warming (D). All options are correct. For the second question: Driving gasoline cars (fossil fuel), burning coal/oil (fossil fuels), and forest burning (releases stored carbon) all increase atmospheric CO₂.

Answer:

First question: E. All of these.
Second question: A. driving gasoline-powered cars, B. burning of coal, C. burning of oil, D. burning of forests