An established ecosystem may remain stable over hundreds of years because *
A. species interdependence is absent
B. there is a lack of variety in the species
C. no competition exists between the species
D. there are natural checks on species

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.