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The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Quetzalcoatlus was one of the largest known flying animals of all time.
Widespread heterotrophic unicellular organisms with constantly changing shapes
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group...
Marsh harriers are birds of prey found almost worldwide.
The lesson introduces you to various types of teeth and their functions.
Penguins are birds living in the Antarctic and adapted to cold temperature and swimming.
Pearls, often used as gemstones, are the by-products of certain molluscs' protective...