Which cell is involved in the immune system

Match the types of competition to their descriptions.

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

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an