When a scientist serves in an enviromental advisory role to society he or she must do what

Which of these statements are true about scientific theories and 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

Name the organs of humanelemintary canal.