Dead matter and waste would pile up without which type of organism? A decomposer
B. consumer
C. producer

The 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.

Ascientist will use that to figure out how or why things are the certain way they are i hope this

That's false, when you're born your skull has not fused together yet.