Dog breeding is an example of natural selection.
Trilobites are index fossils because they ____.
Which trilobite characteristic did not change through time?
The Paleozoic Era is the longest time period in the history of Earth.
If a species can adapt to a changing environment, or ____, its descendants will survive.
Geologic time is divided into units based upon types of ____.
Changes in the trilobite exoskeleton can be attributed to ____.
Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.
____ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.
Scientists used major changes in life forms in the fossil record to form the geologic time scale.
Did you find these answers helpful?