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Burning fossil fuels releases oxides of sulfur and nitrogen. These air pollutants can be responsible for ________.

The oceans affect the biosphere in all of the following ways except

Examine this food web for a particular terrestrial ecosystem. Which species is autotrophic?  

Your friend is wary of environmentalists’ claims that global warming could lead to major biological change on Earth. Which of the following statements can you use in response to your friend’s suspicions?

The human impact that scientists determined has caused the most extinctions on record is ________, and beyond further losses from this impact, the other impact with the largest potential to cause future extinctions is ________.

The goal of restoration ecology is to _____.

After looking at the experiment in the figure above, what can be said about productivity in marine ecosystems?

Match each characteristic with the correct animal clade.

The first step in ecosystem restoration is to _____.

To recycle nutrients, an ecosystem must have, at a minimum, _____.