D: All the variables are controlled except one.
Answer:
River Mississippi is at Flood stage
Explanation:
Although it was last reported on August 4,2019. That's it's above flood stage for most of 2019.
Answer:
Enzymes are involved in the formation and composition of every cell in the body. Thus they also control the working of every organ and even the brain - the control center. They are involved in the breakdown, absorption, distribution and circulation of various nutrients entering the body.
Explanation: