When the American paleobotanist Letariak was analyzing and studying the Late Ordovician ancient soil in Pennsylvania, he discovered the fossilized footprints of some annelids or arthropods that entered deep into the soil from the surface. Based on these fossils, it is inferred that the terres...
All living objects in nature are called organisms. Generally speaking, living things can be divided into three categories: plants, animals and microorganisms. Starfish - an echinoderm There are approximately more than 300,000 known species of plants, which can b...
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