Please help asap. the answers are not in the textbook like they are supposed to be.

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.

9. the history of life on earth is recorded in

Ascientific idea becomes valid when it is what?