External stimulus
The stimulus to which the organism is adapting to is outside of the organism's body.
It is called amino group maybe
<span>Catalase is a common enzyme very important in reproductive reactions and is found in almost all living organisms exposed to oxygen. There are different catalase activities, pH optimum of which between 4 and 11 depending on the species. However, the optimum pH for human catalase is approximately 7.0 (letter C). </span>
Answer:
RBC's?
Explanation:
I'm not sure if this is what is being asked but red blood cells made up about 80% of all of the cells in the human body. I hope this is what you need:)
The elements can be chlorine or bromine