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mass extinction event of 65 million years ago, in which about 85% of all species on Earth died out. This extinction marked the disappearance of the dinosaurs.
a space or gap between two teeth. Many species of mammals have diastemata as a normal feature,...
simple chemical substances needed by the body in relatively small amounts for normal growth and...
single-celled floating algae, which provide food for marine animals, such as fish and whales....