Here's why:

* Macromolecules are large molecules that are built from smaller repeating units called monomers. These monomers join together through a process called polymerization.

* Organic molecules are molecules that contain carbon. Many of the monomers that make up macromolecules are organic molecules.

Here are some examples of macromolecules and their monomers:

* Carbohydrates: Made from monosaccharides (simple sugars)

* Proteins: Made from amino acids

* Nucleic acids (DNA and RNA): Made from nucleotides

* Lipids (fats and oils): Made from glycerol and fatty acids

Let me know if you'd like more information on any of these macromolecules!