If a virus cannot survive on its own, how does it spread? Give an example of how this could happen.

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

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart

This rapid change in species that rarely leaves behind fossil evidence is referred to as