Provide an example of a feedback loop and explain how it affects each four spheres of the earth

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

In what for do plants utilize nitrogen? why do they need nitrogen?

Is there any solid scientific evidence that humans have been cloned?