We pay people a lot to find it. Those people are called oil exploration geologists. Therefore those fossils are buried more deeply than those of creatures that appeared later. This simple fact is so dependable that these geologists can look at the fossils brought up by the oil drill and tell how old that layer of rock is. Where the oil is, and whether there is any, has a lot to do with how old the layers are.
Geologists use the evolutionary sequence of fossils because it works .
Human donors are hard to find, especially for infants, so a daring surgeon convinced the parents to let him implant a baboon's heart. Sadly, Baby Fae died after a few weeks. Among the contributing factors may have been that her immune system had recognized the heart as something foreign, and attacked it. To him, no creatures were related to each other, since they had all been created at once, in their present forms. M aybe a chimpanzee's heart wouldn't have saved Baby Fae either, but the chances might have been better.