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The diagram below shows the nitrogen cycle.

The diagram illustrates the sequence of nitrogen.
In general, the process includes a series of stages like a natural circle. We can see that nitrogen moves in a cycle through the air, plants and animals, and the soil, and back into the air.
The natural cycle of nitrogen begins through the air. After that, the action of lightning and free-living nitrogen-fixing bacteria carries the nitrogen into the soil. At the same time, nitrogen-fixing bacteria nodules of leguminous plants take the nitrogen directly from the air. The nitrogen in the soil is taken up by non-leguminous green plants, while, leguminous plants derive nitrogen directly from the bacteria in nodules.
Both types of plants are consumed by animals. Then, when animals and plants die, or the animals excreta their food, the nitrogen is returned to the soil, where it is acted on by dentrifying bacteria. This cause the nitrogen is returned to the air, and the cycle continues.
The diagram illustrates the sequence of nitrogen.

In general
, the process includes a series of stages like a natural circle. We can
see
that nitrogen
moves
in a cycle through the air, plants and animals, and the soil, and back into the air.

The natural cycle of nitrogen
begins
through the air. After that, the action of lightning and free-living nitrogen-fixing bacteria carries the nitrogen into the soil. At the same time, nitrogen-fixing bacteria nodules of leguminous plants take the nitrogen
directly
from the air. The nitrogen in the soil
is taken
up by non-leguminous green plants, while, leguminous plants derive nitrogen
directly
from the bacteria in nodules.

Both types of plants
are consumed
by animals. Then, when animals and plants
die
, or the animals excreta their food, the nitrogen
is returned
to the soil, where it
is acted
on by
dentrifying
bacteria. This cause the nitrogen
is returned
to the air, and the cycle continues.

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