Spiders and their Webs – Biology

By |2017-09-16T18:40:57-07:00May 25th, 2017|Biology|Comments Off on Spiders and their Webs – Biology

Fossil spider from the Cretaceous era Spiders evolved from annelid worms beginning about 540 million years ago. They were among the first land creatures with more than one cell. At about the same time, the [...]