I would say that the fishes exhibited the greatest diversity (though the brachiopods also had considerable diversity) and mostly were of the ostracoderms (with a platey or shell-like skin and no jawbone) which exhibited many varieties and also the placoderm which had gills, a jawbone and fins so was developing characteristics of modern fish.
Answer:
C. When running that is the answer
CHO is the short term for carbohydrate in medical lingo.
So it would be Carbon, Hydrogen and Oxygen
A. Carbon is the answer
It is a process that causes rock to break into little pieces.
As the tissue heals, new scar tissue is created inside of the damaged heart tissue, thus it doesn't pump as well as healthy heart tissue