I think it would be proteins!
Hydrolysis or digestion
the hull
the above portion of the earth is called the earth's crust
A substance that speeds the changing of food into a usable form* is called an enzyme. More generally, in any chemical context, a substance that speeds a reaction without itself being changed is called a catalyst._______________________________________*This changing of food into a usable form is called "digestion".
It is the Asthenosphere
Foods have many usable parts. Some need to have the seeds removed to reach the usable section. Others have vitamins in the skin, and it is preferable to eat the skin as well.
Buffet restaurants keep the usable leftover foods that will not spoil make other dishes at the restaurant.
While water covers much of Earth's surface, only a small portion of that water is usable.
they break down foods into sugars usable by the body to create energy in the form of ATP
the mitochondria converts foods such as sugars into usable energy for the cell
It depends on the food.
A portion of butter is called a Pat of butter
Nutrients are usable by all parts of your body to grow, to repair, to recover, etc., making health better. Energy-dense foods are usable only for a brief time by limited tissues (e.g. muscles, brain), and lead to obesity in excess, which makes health worse.
The upper portion of a fraction is called the numerator.
Portion of the area of a circle is called a sector.
The star studded portion of the American flag is called the Star Studded Portion.
The visible portion of the tooth is called the crown. The submerged portion is called the root.