Changes in the environment result in ____.
____ is a process by which organisms with characteristics suited to the environment will survive and reproduce.
Scientists used major changes in life forms in the fossil record to form the geologic time scale.
The division of Earth’s history into smaller units makes up the ____.
____ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.
The longest subdivision in geologic time is a(n) ____.
Which trilobite characteristic did not change through time?
Geologic time is divided into units based upon types of ____.
Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.
Changes in the trilobite exoskeleton can be attributed to ____.
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