What is digested into smaller molecules which can be synthesized into fat, starch, protein, and dna?

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Organic molecules, because organic molecules are what we consume as food. Inorganic compounds are traditionally viewed as being synthesized by the agency of geological systems. Aka, rocks and stuff.
catalysts are enzymes that speed up processes such as digestion, and simple sugars are monosaccharides that can not be broken down farther. 

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The Organism belongs in Kingdom Fungi because Fungi can be multicellular, most cannot move, and they get food by releasing digestive juices into their environment.