what was the date 200 million years ago

When did the Triassic period start? Because the Moon helps stabilize the tilt of the Earth's rotation, it prevents the Earth from wobbling between climatic extremes. Gastornis , a large flightless bird, appears in the fossil record. Before the Permian extinction, Archaeplastida red and green algae had been the major marine phytoplanktons since about — million years ago, [46] when they replaced marine planktonic cyanobacteria , which first appeared about million years ago, as the dominant phytoplankton in the oceans. This small group eventually becomes the echinoderms starfish, brittle stars and their relatives and two worm-like families called the hemichordates and Xenoturbellida. Confounding factors rack up for species that are very distantly related, making the earlier dates more uncertain. Domestication of various ungulates.

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