Earth history; Silurian
To be able to live on dry land, both plants and animals had to develop the ability to breathe and avoid desiccation at the same time. Land plants evolved from the green algae in the water, and by the end of the Silurian, the land plants were established; at first along the coast and in the damp low-lying areas. They were a few centimetres tall, with simple, forked, stiff stalks and stems below the surface functioning as roots. Leaves were not developed. The plants made the foundation for animal life on land. The arthropods, having a stiff, watertight shell and well developed walking legs, were already well equipped for life on land. Plant remains along the beach and on land could form a damp dwelling-place, which was rich in nutrients and protective against the sun. Among the first animals on land were sea scorpions, land scorpions, millipedes and ticks.
Publisert 18. mai 2011 16:00 - Sist endret 13. mai 2019 14:27