What is a hydrogen bond? Why does it occur? What molecule likes to form hydrogen bonds?

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Where substance is produced during cellular respiration

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm