The answer : Genes
Genes tell cells how to function and what traits to express
They are symmetrically arranged.
Nucleotides are a base pair and they fit together because their shape allows them to bond. The A-T pair frames two hydrogen bonds. G-C forms 3. As the strands bond they hold the Base Pairs of DNA together
It would be Primary because the lake is it’s starting point and the pollution grew all the way to the factory.
