Which of the following provides a first line of defense against pathogens?

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.

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.

The image below shows a weather service map. which details best describe this map? check all that apply