Nitrogen-fixing bacteria making nitrogen available for use by other
organisms to utilize is an example
of..
A. mutualism.
B. commensalism.
C. decomposition

The nitrogen fixation bacteria makes the nitrogen available for the plants directly into the soil. This is an example of mutualism, where both bacteria and organisms are benefited.

Most leguminous plants like peas, bans, and cloves have colonies of nitrogen fixation bacteria.  These bacteria are found attached to the roots nodules and tend to fix the nitrogen. Through this, the bacteria gain sugar from the plant.

Hence mutualism is the end product of the interaction. This option A is correct.

link.

I believe the correct answer is A. mutualism

hypothalamus or body temperature

Explanation:

Once the body temperature is back to the correct level, sweating will stop. In the opposite way, if the hypothalamus detects that the body is too cold then the response is that the body begins to shiver to try and raise the temperature back to the correct level.

Hope it helps:)

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Answered by Aurinda;)