The lion eats an antelope that ate the grass

Carbon from grass doesn't end up in a lion.

The lion absorbs the carbon given off by transpiration

The lion breathes in carbon given out by the plant

Both involve liquid substances falling to the Earth from the atmosphere?

Neither process works at low temperature.

Both involve the transfer of substances between animals, plants, and the Earth.

Both involve the transfer of substances between the earth and outer space.

Tree roots expel carbon into the soil as they grow.

Humans use machines to pump carbon dioxide into large underground rocks.

Rocks become richer in carbon as time goes by.

The carbon-rich bodies of plants and animals decay into the earth after they die.

change nitrate back into nitrogen gas

change nitrogen gas into nitrate

absorb carbon dioxide in the soil

release oxygen gas into the atmosphere

proteins

enzymes

cells

all of these