http://en.wikipedia.org/wiki/Mammal
The first amniotes apparently arose in the Late Carboniferous. They descended from earlier reptiliomorph amphibians,which lived on land that was already inhabited by insects and other invertebrates as well as by ferns, mosses and other plants. Within a few million years, two important amniote lineages became distinct: the synapsids, which include mammals; and the sauropsids, which include turtles, lizards, snakes, crocodilians, dinosaurs and birds.Synapsids have a single hole (temporal fenestra) low on each side of the skull.
The first amniotes apparently arose in the Late Carboniferous. They descended from earlier reptiliomorph amphibians,which lived on land that was already inhabited by insects and other invertebrates as well as by ferns, mosses and other plants. Within a few million years, two important amniote lineages became distinct: the synapsids, which include mammals; and the sauropsids, which include turtles, lizards, snakes, crocodilians, dinosaurs and birds.Synapsids have a single hole (temporal fenestra) low on each side of the skull.
No comments:
Post a Comment