Changes in the environment result in ____.a.geologic erasc.plate tectonic changesb.physical changes in speciesd.all of the above
____ is a process by which organisms with characteristics suited to the environment will survive and reproduce.a.Natural selectionc.Evolutionb.Artificial selectiond.Organic evolution
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 ____.a.erasc.periodsb.geologic time scaled.sequence of events
____ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.a.Erasc.Epochsb.Periodsd.all of the above
The longest subdivision in geologic time is a(n) ____.a.epochc.centuryb.periodd.eon
Geologic time is divided into units based upon types of ____.a.sedimentary rocksc.organismsb.climatic changesd.igneous rocks
Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.a.natural selectionc.Pangaeab.the environmentd.the geologic time scale
Changes in the trilobite exoskeleton can be attributed to ____.a.changing environmentsc.inter-species matingb.competition for survivald.both a and b
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