The history of animal life on earth:
1) Invertebrate animal appearance
2) The Cambrian animal diversity explosion
3) Vertebrate animal appearance
4) Land colonization
5) How the amniotic egg appears
6) The surge in animal variety following the Cretaceous
What is diversity?
Three components of biological diversity—genetic, species, and ecosystem—are referred to as the world's diversity of species and ecosystems, as well as the ecological processes to which they contribute.
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