Give me an example for 100 brainless

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.

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

What is hydroelectric power produced by?