Enzymes<span> are protein molecules that are manufactured by all plant and animal cells. All cells require </span>enzymes<span> to survive and </span>function<span>. </span>Enzymes<span> are catalysts, which means that they make chemical reactions go faster, but are not changed by the reaction.</span>
The answer to this is all of the above.
At School level Answer is {C}
But Recent Research showed that Hemoglobin is present in Plants in different form
