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Silurian period – Fish get jaws

By |2018-04-19T11:29:11+00:00June 25th, 2017|Biology, Geology|

Silurian period: Trout swimming When was the Silurian period? The beginning of the Silurian period was about 443 million years ago. Some environmental problem at the end of the Ordovician period (probably ice ages) killed most of the plants and animals on Earth. The creatures that survived this extinction were the ones that [...]

History of Fish – Biology

By |2018-04-09T23:39:25+00:00May 26th, 2017|Biology|

History of fish: it looks like a severed tentacle but it's a lamprey. About 510 million years ago, in the Cambrian period, some of the worms on Earth evolved into the earliest fish. Fish were different from worms because they had spinal cords, nerves running all along their backs that carried messages to [...]