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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 the d
The giant Chinese salamander is the largest salamander in the world. It is considered critically endangered and can only be found in rocky mountain streams/lakes in China
The world’s oldest known spider web has been discovered on a beach in Sussex, England, trapped inside an ancient chunk of amber. Scientists found the rare amber fossil in December, and have now confirmed that it contains remnants of spider silk spun roughly 140 million years ago by an ancestor of modern orb-weaving spiders.