Very long and large organic molecules called are made of small units called . examples of the small units include sugars, which combine to form ; nucleotides, which form ; and amino acids, which form

Very long and large organic molecules are called macromolecules and are made up of smaller units called monomers. Examples of small units include sugars which combine to form carbohydrates , nucleotides, which combine to form nucleic acids; and amino acids which form proteins.

Explanation:

Examples of carbohydrates which are polymers of sugar are cellulose, starch, chitin etc. Nucleic acids namely the DNA and RNA are composed of sugar, nitrogen bases and phosphate group.  Monomers that make up proteins are amino acids.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

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