Every year millions of crops are lost due to pests. In recent times, however, scientists have learned that they can insert a gene into the DNA of specific crops that gives them a higher pest-resistance than normal. This technology allows farmers to have higher crop yields and increases the supply of valuable food sources

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