Describe the three classes of flatworms

Flukes: a group of flatworms that are parasitic in nature, often specializing in Frogs, Fish, and Turtles

Planarians: free swimming, predatory freshwater flatworms that can regenerate themselves if cut in half

Tapeworms: parasitic flatworms that live in the intestines of warm blooded animals

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides