Today, it's widely accepted that all of the two legged meat eating dinosaurs known ad theropods including T. rex and Albertosaurus according to the tree you built, what distinguishes the feathers of modern birds and archaeopteryx from the feathers of other theropods

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c.more precipitation,but only when emission levels.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex