This would be D. Cross training!
Cross training is when you are trained in multiples areas incase something happens and someone cannot show up for their job.
Well if you're referring to the human body, our cells make up a lot of everything we're made of. Muscles, organs, bones, blood, skin, etc. Biologically speaking, there's a lot to the human body besides organs. Sorry if this isn't very helpful.
B. Tooth Decay - because of the acid from your stomach rests on your teeth.
Answer:U.S. law arises from several levels of government: state, federal and local. It also arises from the three branches of U.S. government: legislative, executive and judicial. These pages introduce the relationships among the three branches of government and among these levels of U.S. government
Explanation:
Endothelium, that’s what the blank would be.