What part of a seed holds the food/ energy

Endosperm

Explanation:

The endosperm is the tissue where food is stored, it surrounds the developing seed of flowering plants and provides nourishment to it.

The endosperm develops from the male gamete that fuses with another cell named the polar nuclei, and is usually triploid (with three sets of chromosomes)

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.