| Term | Definition |
|---|
| fossil | Evidence of a living thing that lived long ago is called a(n) _____________. |
| tracks | By observing the patterns of dinosaur ______________, scientists learned how the dinosaurs walked. |
| rocks | Most fossils are found in _______________. |
| soft parts | When an organism dies, its _______________ quickly decay or are eaten. |
| mold | The hard parts of dead organisms are more likely to become a ____________ fossil. |
| amber | Tree sap can harden into ____________ and preserve an entire organism. |
| imprint | Some fossils form when an organism presses into a soft surface, leaving a(n) ___________. |
| change | When an entire group of organisms die, it is probably because they did not adapt to ____________. |
| disappear | If an organism does not meet its needs after a change, it can slowly __________. |
| classify | Scientist _____________ living things according to how many of their kind are left. |
| endangered | If only a few of its kind are left, the species is ______________. |
| extinct | When no members are left, the species is _______________. |
| extinct | Scientists try to keep animals from becoming endangered or ____________ by moving the animals to places where they are safe and protected. |
| protected | Scientists try to keep animals from becoming endangered or extinct by moving the animals to places where they are __________. |
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