Help me please.please

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

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

What are some characteristics of a free enterprise economy?