. Adventures with animals and plants. Biology. PROBLEM 2. We Learn of Prehistoric Living Things from Fossils 541. Fig. 493 Skeletons of the modern horse and Eohippus to show comparative sizes. What resemblances and differences can you see? (American museum of natural history) ERA Psychozoic 1,000,000 years Cenozoic 60,000,000 years Mesozoic 200,000,000 years Paleozoic 550,000,000 years Proterozoic 1,000,000,000 years Archeozoic 2,000,000,000 years AGE OF Man Mammals '"" Reptiles Amphibians Fishes Invertebrates Simple living forms Earliest living things \^l Fig. 494 The numbers in the
. Adventures with animals and plants. Biology. PROBLEM 2. We Learn of Prehistoric Living Things from Fossils 541. Fig. 493 Skeletons of the modern horse and Eohippus to show comparative sizes. What resemblances and differences can you see? (American museum of natural history) ERA Psychozoic 1,000,000 years Cenozoic 60,000,000 years Mesozoic 200,000,000 years Paleozoic 550,000,000 years Proterozoic 1,000,000,000 years Archeozoic 2,000,000,000 years AGE OF Man Mammals '"" Reptiles Amphibians Fishes Invertebrates Simple living forms Earliest living things \^l Fig. 494 The numbers in the left column tell when each era began. The wider a branch at any level the more numerous were the species at that time. Which is the widest branch now? Some grow narrower near the top. Why?. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-. Boston : D. C. Heath
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