Can someone please help this is a Ecology quiz

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

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

What term describes a doctor who becomes a specialist by meeting standards beyond those of getting a license and passing a test in the specialty area?