Models in a collection room of the Royal Ontario Museum show the diversity of ancient invertebrates found in the Burgess Shale. (Evan Mitsui/CBC) The fossil Dunn studied, Auroralumina attenboroughii, was a huge jellyfish polyp that lived 557 million to 5...
Fish come in all kinds of shapes, sizes and colors. They first appeared in the oceans of the earth about 500 million years ago. Today there are tens of thousands of different kinds of fish and new species are discovered every year. Where fish live 1 They preferably live in areas where ...
七选五阅读体裁难度词数建议用时实际用时正确率说明文易中难2687分钟Fish come in all kinds of shapes, sizes and colors. They first appeared in the oceans of the earth about 500 million years ago. Today there are tens of thousands of different kinds of fish and new species are discovered every ...
Though fish first appeared on earth approximately 500 million years ago, prehistoric ancestors of the white sturgeon date back about 175 million years. This fish likely evolved from an extinct order of fishes called Palaeonisciformes, which existed near the end of the Silurian Period about 419 mil...
Sixty-six million years ago, the ocean was a different place. Sharks and octopus-like creatures were powerful. But scientist Elizabeth Sibert ways there were other important species as well. “ There were also many reptiles(爬行动物)in the ocean that were swimming around. An...
Fish have been on the Earth for more than 500 million years. They were in existence long before dinosaurs roamed the Earth. Click for more.
Byline: ANDY LINES Chief ReporterThe Mirror (London, England)
Jellyfish appear earlier than the dinosaur, dating back to the 650 million years ago. 翻译结果4复制译文编辑译文朗读译文返回顶部 There are also earlier than the dinosaurs' jellyfish, can be traced back to the 650 million years ago. 翻译结果5复制译文编辑译文朗读译文返回顶部 ...
Imagine a warm spring day 66 million years ago. Fish would have been swimming in the rivers in an area that’s now North Dakota in the US. Seconds later, the peace was ended by destruction. These could have been the very last moments of the dinosaur era when a city-sized asteroid (小...
Such optimism arises from comparative studies between, for example, the pufferfish (FuguandTetraodon) andhuman genomes. Pufferfish diverged from lobe-finned fishes (which gave rise to tetrapods) 450 million to 500 million years ago. The pufferfish genome is compact and has essentially the same info...