Unit 6 Review

How does most of the carbon in an organism’s body return to the environment after the organism dies?

• Decomposers break the body down into simpler compounds.

• Heat from the sun causes the carbon in the body to evaporate.

• Geological processes cause the body to turn into a fossil fuel.

• Rainwater dissolves the carbon in the body and carries it to the ocean.

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Why is an increase of carbon dioxide in the atmosphere a concern?

• Carbon dioxide is a greenhouse gas, meaning too much could decrease global temperatures.

• Too much carbon in the atmosphere would destroy the ozone layer.

• Carbon dioxide is a greenhouse gas, meaning too much could increase global temperatures.

• Too much carbon in the atmosphere would cause destructive earthquakes.

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The water cycle is a closed system, meaning no water comes in or out.

• True

• False

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Movement of nitrogen from the atmosphere to soil can be accomplished by:

• Nitrogen fixing bacteria

• Animal waste production

• Fossil fuel burning

• Runoff from rocks

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If current trends continue, what can be expected in 2030?

• Sea levels will continue to rise as ice melts and temperatures increase.

• Sea levels will stabilize, preventing further ice loss.

• Arctic ice extent will begin to recover.

• CO₂ concentration will decrease.

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NGSS.HS-ESS3-5

Which of the following statements is true about climate change’s influence on polar ecosystems?

• More algae will thrive as polar regions decrease in temperature over time.

• Polar bears will most likely have to develop different hunting techniques to account for changes in the ice landscape.

• More heat will be reflected as polar ice decreases, lowering global temperatures.

• Penguin populations will see an immediate decrease as more breeding grounds appear with bare rock exposed.

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What role does arctic ice play in regulating the earth’s temperature?

• Arctic ice absorbs more sunlight, warming the planet in the process.

• Arctic ice reflects sunlight back into space, helping to cool the Earth.

• Arctic ice increases ocean temperatures, reducing climate change.

• Arctic ice produces oxygen for the atmosphere, decreasing global temperatures.

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What is one major reason for the decline of coral reefs since the 1970s?

• Decreased salinity in ocean water

• Rising sea levels reducing sunlight

• Increased sea surface temperatures and pollution

• Excessive coral growth blocking fish habitats

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Using the food web, answer the following: How would coral bleaching affect this coral reef ecosystem?

• The long-spined sea urchin may increase in population due to gaining two new food sources.

• The hawksbill sea turtle population would go extinct due to the lack of sponges.

• Star corals would exponentially increase in population size.

• The stoplight parrotfish may decline in population due to losing two food sources.

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Which human activity is most directly responsible for increasing ocean acidification?

• Overfishing

• Deforestation

• Burning fossil fuels

• Dumping plastic waste into the ocean