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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.

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

The pelican's beak is adapted for in .