Why must there be variation in a population in order for natural selection to occur?

Select the best answer for the question, ly 12. which of the following behaviors is not an inherited behavior?

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

Which part of cellular respiration must occur before any of the other steps can occur