Answer: A
Explanation: Homeostasis is the ability to keep an organism, cell at a maintenance to keep stability and regulation in order for it to function properly.
The difference between pH 3 and pH 4 is a 10 fold difference in the concentration of H+
Protiens in the blood cause blood clotting
One way would be to administer an IQ and then compare the results to other age group averages to determine a relative mental age.
