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Devonian Period – Gondwana, ferns, lungfish

By |2019-05-07T05:56:55-07:00June 24th, 2017|Biology, Geology|

Coelocanth: a fish from the Devonian period When was the Devonian period? Four hundred and sixteen million years ago, when the Silurian period ended and the Devonian period began, most of the land on Earth was clumped together into a supercontinent called Gondwana. Silurian period Plate tectonics All our geology articles Life in [...]

Evolution of bones – Skeletons and Biology

By |2017-05-28T00:44:16-07:00May 28th, 2017|Biology|

A fish skeleton One-celled animals don't have any support system that holds them in a certain shape. Plants do have a support system, but it's the cellulose in the cell wall of each cell, rather than bones. Early multi-celled animals like jellyfish and sponges and worms also didn't have skeletons, but beginning with [...]

Why do we have fingers? Skeletons, Evolution, and Biology

By |2017-05-28T00:38:23-07:00May 28th, 2017|Biology|

Human hand bones The first fingers and toes evolved from earlier fish fins about 400 million years ago. During the Devonian period, the oceans were very shallow, and some fish evolved to be able to push themselves out of the water to breathe the air. For this, they needed stronger fins that they [...]

Circulatory System – Biology and Evolution

By |2019-04-06T18:43:26-07:00May 26th, 2017|Biology|

Circulatory system: A dog heart What is the circulatory system? The circulatory system takes food and air from outside your body and brings it all over your body so that all your cells get the food and oxygen they need to stay alive. The first cells evolve The nervous system The digestive system [...]

Lungfish – Evolution of Fish

By |2018-04-15T17:26:06-07:00May 26th, 2017|Biology|

Evolution of fish: a lungfish About 400 million years ago, during the Devonian period, the Earth was going through an especially warm period. Some of the smaller oceans and lakes were drying up, leaving big muddy puddles all around them. This was no good for fish, which had less room to swim around [...]