What statement about blood types is true? a. all blood is the same b. 5 types of blood c. some blood types can be fixed d. all blood types are compatible

I would say that it is none of the above because there are four blood types A, B, AB and O.  If you are forced to choose an answer then I would choose B. 5 types of blood.

answer; genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes;

answer; /// i believe its the cochlea;