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☆☆☆☆☆Younger than the rock it intrudes into
The constituent time segments are epochs and periods, which are further divided into ages.
About 540 million years ago.
They had little competition from other land dwellers
pangaea cause of breaking up was a rift that developed between eastern U.S. and Western Africa
Are constant
Paleozoic
compressional forces
meteorite collision
Archaeopteryx is considered the 1st Bird.
It was from a long line of Avian dinosaurs which are very very closely related to the Raptor family of Therapod Dinosaurs.
The morphology of avian dinosaurs and modern birds are so similar many scientist class birds as avian dinosaurs.
Uniformitarianism
photosynthesis
age of mammals
Based on the popular theory that the dinosaurs went extinct due to the impact of a large asteroid, scientists think that the asteroid caused large amounts of debris to fly into the atmosphere, blocking out the sun. This caused global temperatures to drop, thus freezing the plants. In addition, without the sun the plants could not carry on photosynthesis, which caused them to die.
Cretaceous
jurassic
triassic
Many dinosaurs have birdlike traits. The basic body plan of theropods (the two legged carnivores) is somewhat birdlike. However some of these are especially birdlike. Among these are Archeopteryx, which is widely attributed to be the earliest known bird and clearly has traits of maniraptoran theropods. A number of maniraptorans such as Velociraptor are now known to have had large, well-developed feathers. One relative, Microraptor, is believed to have been able to glide between trees.
There is not many remains of the Precambrian time
A 60,000 year old mammoth bone.
It enlarges continental landmasses and forms mountains along the edges of continents.
Insulating body hair is a characteristics of the layer of the fat beneath the human skin.
