The higher frequency of a photon, the

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 the formed elements (cell or parts of cell) in blood and what are their functions ?

What did hunter gathers do to alter the environment?