VivienMartine

VivienMartine

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Rock Layers: Timeline of Life on EarthEvolution is a complicated subject. While everybody understands that black bears are related to grizzly bears and we can even figure they are related to extinct bears, lots of people wonder how scientists can be so sure that bears are related to salmon as well.    One evidence is rock layers—specifically, what is called the geologic column. Basically, scientists have learned that rocks are stacked in layers containing fossils with the oldest fossils at…

Rock Layers: Timeline of Life on EarthEvolution is a complicated subject. While everybody understands that black bears are related to grizzly bears and we can even figure they are related to extinct bears, lots of people wonder how scientists can be so su