Lesson 2.2 Cycles of Matter Answers

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Which human activity would most likely decrease the amount of carbon in the atmosphere?

clearing forests

heating coal

burning wood

planting trees

The diagram illustrates part of the carbon cycle.

A consumer is obtaining carbon by breathing it in from the atmosphere.

A consumer is obtaining carbon by absorbing it from the soil.

A consumer is obtaining carbon by eating carbon-based molecules stored in a producer.

A consumer is obtaining carbon by eating carbon-based molecules stored in a decomposer.

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precipitation

transpiration

evaporation

condensation

Which processes result in the release of carbon? Select three options.

Animals break down food molecules to obtain energy.

The remains of producers are broken down by decomposers.

The remains of consumers are broken down by soil decomposers.

Producers take in carbon dioxide.

Producers make sugars and starches.

After Gerry mows his lawn, he often puts the grass clippings into his flower garden.How will this affect his garden?

It will decrease the amount of carbon in the soil and decrease the amount of carbon dioxide released by decomposers.

It will increase the amount of carbon in the soil and decrease the amount of carbon dioxide released by decomposers.

It will decrease the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.

It will increase the amount of carbon in the soil and increase the amount of carbon dioxide released by decomposers.

Some bacteria live in the roots of plants like soybeans and peas.

to absorb nitrogen-containing compounds from the soil

to release free nitrogen into the atmosphere

to break down nitrogen-containing compounds in dead organisms

to convert free nitrogen into usable nitrogen

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