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posted by GabsSaw
Liverworts grew on mats of blue-green algae, which trapped nitrogen from the air. They used this nitrogen to grow.

Spriggina has a curved, shieldlike end to one part of its body. Some paleontologists think this was its head, while others think it was an anchor that secured it to the seabed.

Hemicyclaspis had eyes on 最佳, 返回页首 of its head. This suggests it lived on the seabed and used its eyes to keep a look out for predators above.

Another difference between jawed and jawless 鱼 was that jawed 鱼 had a pair of nostrils, while jawless 鱼 had just one.

Prehistoric sharks' jaws were fixed to the side...
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