Scientists called paleontologists study the lives of prehistoric plants and animals by looking at fossils.
When these animals and plants died, soil settled on top of them. Over time, this soil gradually hardened into rock. This happened again and again till there were several layers of rock, with the oldest layer at the bottom. The print of the dead animal or plant that died during a certain period can be seen clearly on the rocks. These prints are called fossils. Fossils have helped us to discover what life was like before humans were around.
As the seas filled with more animals feeding on one another, some marine creatures (including some fish) began to move to land to escape their predators and to get food more easily. Some of these creatures developed into insects like mayflies and dragonflies. They grew lungs and their fins changed to legs. These were the very first amphibians – animals that could live either on land or in water.
A typical animal of this period was the acanthostega. It had four stubby feet and looked like a lizard. It spent most of its time on the shores of lagoons.
images: pixabay, wikipedia
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