Astatement is best to use when refining your hypothesis

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

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Can someone i have no idea of how to do this.