When using the evolutionary time frame we usually separate living organisms into the two categories that you mentioned, e.g. modern or prehistoric. As those who have acknowledged the biblical Flood as the major factor in the creation of the geologic column as well as the fossil record, we would not by apt to buy into the classic evolutionary argument concerning change over time.
Have you ever wondered why so many extinct species of plants and animals look almost exactly like their modern-day counterparts? The textbooks are filled with examples of “living fossils.” What we find is nearly, if not completely, identical organisms remaining virtually unchanged. These fossils are supposed to be really, really, really old, but they look nearly identical to the ones that live today.