| A | B |
|---|
| ADAPTATION | AN INHERITED TRAIT THAT MAKES AN ORGANISM BETTER ABLE TO LIVE IN ITS ENVIRONMENT |
| MUTATION | A CHANGE IN THE GENES OF A CELL |
| CAST FOSSIL | FOSSIL THAT HAS THE SAME OUTER SHAPE AS THE ORGANISM THAT FORMED IT |
| EXTINCT | SPECIES THAT NO LONGER EXISTS |
| FOSSIL | PRESERVED REMAINS OF AN ORGANISM |
| MOLD FOSSIL | A HOLLOW SPACE IN THE SHAPE OF A ONCE-LIVING THING |
| RADIOACTIVE DATING | DETERMINES THE AGE OF A FOSSIL |
| EVOLUTION | CHANGE THAT OCCURS IN LIVING THINGS OVER TIME |
| NATURAL SELECTION | SURVIVAL OF ORGANISMS BEST SUITED TO THEIR ENVIRONMENT |
| CHARLES DARWIN | PROPOSED THEORY OF NATURAL SELECTION |
| JEAN LAMARCK | PROPOSED THEORY OF ACQUIRED CHARACTERISTICS |
| SURVIVAL OF THE FITTEST | SYNONYM FOR NATURAL SELECTION |
