Changes in the trilobite exoskeleton can be attributed to ____.
The longest subdivision in geologic time is a(n) ____.
Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.
Trilobites are index fossils because they ____.
Changes in the environment result in ____.
Geologic time is divided into units based upon types of ____.
____ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.
Dog breeding is an example of natural selection.
Scientists used major changes in life forms in the fossil record to form the geologic time scale.
If a species can adapt to a changing environment, or ____, its descendants will survive.
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