I need help.

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 characteristic make legumes a good food source for food insecure populations

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above