Complex organisms need cells that can perform many different functions. they need to be supported on a cellular level. Without specialized cells you they won't be able to perform different functions.
The correct answer is protein.
The Recommended Dietary Allowance (RDA) is set by the Food and Nutrition Board of the Institute of Medicine. It represents the average daily level of nutrient intake which is sufficient to meet the needs of nearly all healthy people.
According to the RDA, the daily intake of protein for healthy adults is 0.8 grams per kilogram of body weight.
Denature
as
when something causes the enzyme to change shape, thus changing shape of the active site and not allowing any substrate molecules to fit in the site and bind. Denaturation makes it so reactions don't occur between the substrate and the enzyme
Using the law of superposition
