Cycles of Matter Answers

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Which statements accurately describe the roles of decomposers in the carbon cycle? Select three options.

Decomposers release carbon dioxide into the air as waste.

Decomposers remove carbon dioxide from the air during photosynthesis.

Decomposers break down the remains of dead plants and animals.

Decomposers return carbon compounds to the soil.

Decomposers use carbon to make food molecules.

What is free nitrogen?

nitrogen that is ready for plants to use

nitrogen that has been fixed by bacteria

nitrogen that cannot be used by organisms

nitrogen that is returned to the soil by decomposers

How do plants obtain nitrogen?

They remove it from the air.

They absorb it through their roots.

They fix it in their leaves.

They produce it in their stems.

Once water vapor has been released into the atmosphere, it rises and cools, turning back into a liquid. What is this process called?

evaporation

condensation

fixation

precipitation

What occurs at stage A?

Water cools and turns to liquid.

Water becomes runoff or groundwater.

Water vapor clumps around dust particles.

Water evaporates from surfaces.

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