I believe it would be C) Cellulose. As this is one of the essential components found in the cell wall of plant cells.
Yes we did we had microbes before we were born
A. Thst is what they are doing xD
Added to make certain structure easier to see.
Vitamins are not a source of energy because they are essential nutrients that the body needs. Vitamins are needed to help the body function, they are not direct energy but they help it to break down fats, proteins, and carbs into sugars and enzymes that help it to improve.