Which of the following describes a form of active transport

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

At which location in earth’s interior does the top density continue to increase as thickness decreases?

Where in the cell are ribosomes made?