B .How organisms could change .
Answer:
I’m not sure if both do the rest but A. is right so ig A.
The frog ringer solution is a solution of several salts which are dissolved in water in order to create an isotonic solution relative to the body fluid of an animal. The frog ringer solution that is used to bathe nerves must contain calcium in order to maintain the natural environment of the nerves. In the body the nerves are continuously exposed to different level of calcium ion and this must be taken into consideration during the preparation of specimen.<span />
True
Amino acids are the basic building blocks of the body. They are also sources of energy, like fats and carbohydrates. However, amino acids<span> are structurally characterised by the fact that they contain nitrogen (N), whereas fats and carbohydrates do not.
</span>
The importance of amino acids as the precursors of enzymes and neurotransmitters<span> is often underestimated. As such, amino acids regulate almost all of the metabolic processes in the human body, and they are essential for a healthy body.</span>