Apatosaurus considered a junior synonym of "Apatosaurus"; its only species was reclassified as "A.excelsus" in 1903. A 2015 study concluded that "Brontosaurus" is a valid genus of sauropod distinct from "Apatosaurus", but not all paleontologists agree with this division. As it existed in North America during the late Jurassic, "Apatosaurus" would have lived alongside dinosaurs such as "Allosaurus", "Camarasaurus", "Diplodocus", and "Stegosaurus". "Apatosaurus" was a large, long-necked, quadrupedal animal with a long, whip-like tail. Its forelimbs were slightly shorter than its hindlimbs. Most size estimates are based on specimen CM3018, the type specimen of "A.louisae". In 1936 this was measured to
Knowing and the Known with animals and plants, as well as objects of all types, in any environment. Men and women have, are, and will present their acts of knowing and known in language. Generic people, and specific men and women, are known to be vulnerable to error. Consequently, all knowledge (knowing and known) whether commonsensical or scientific; past, present, or future; is subject to further inquiry, examination, review, and revision. Knowing and the Known Knowing and the Known is a 1949 book by John Dewey and Arthur Bentley. As well as a Preface, an Introduction and an Index, the book consists of 12