Classifying things by observation can best be done by using a

What maintain homeostasis when a persons internal body temperature is 97.5°f

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

What does the number 18.9984 represent in the image?