The pre-Flood world was teeming with some pretty amazing animals. Then the Flood came, rapidly burying and entombing trillions of creatures in sediments that lithified into rocks such as shale, limestone, and sandstone.

A virus is a very tiny structure that, in its simplest definition, is some nucleic acid (either DNA or RNA) packed inside a protein coat. Viruses can’t live on their own—they are designed to replicate inside living cells.