Apsychologist would say that she enjoys the game because it acts as a

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.

What is the problem in this article? what solution does the article propose?

Several billion years ago which gas was the least prevailant in the atmosphere