a. Any of various photosynthetic, eukaryotic, multicellular organisms of the kingdom Plantae characteristically containing chloroplasts, having cell walls made of cellulose, producing embryos, and lacking the power of locomotion. Plants include trees, bushes, herbs, ferns, mosses, and certain green algae.
b. A plant having no permanent woody stem; an herb.
c. Any of various fungi, algae, or protists that resemble plants and were formerly classified in the plant kingdom
Substance definition- A specific type of matter, esp a homogeneous material with a definite composition
Small molecule Wiki-https://en.wikipedia.org/wiki/Small_molecule
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