How can new species arise through isolation

Ectocarpene is a volatile, sperm cell-attracting material released by the eggs of the seaweed ectocarpus siliculosus. its constitution is all the double bonds are cis, and the absolute configuration of the chirality center is s. draw a stereochemically accurate representation of ectocarpene.

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

What advantages does a pedigree have over a written passage?