Amacromolecule isolated from the bone of dinosaurs is found to have primary chains of nitrogen-carbon-carbon repeats. it would be classified as what type of molecule?

It would be classified as protein, or more precisly polypeptide chain.

Polypeptide chain is the basic component of proteins and it is composed of amino acids linked by peptide (amide) bonds. . A polypeptide is a long  and unbranched and  one or more polypeptides are arranged in a biologically functional way to form the protein with different functions.

Answer;

-A polypeptide

Explanation;

-Polypeptides are chains of amino acids. Proteins are made up of one or more polypeptide molecules. The amino acids are linked covalently by peptide bonds. Each amino acid residue is then bonded via peptide bonds.

-Because each amino acid has a unique R group, a particular amino acid sequence creates a polypeptide whose function is dependent upon its chemical structure.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.