WebLater prokaryotes were photosynthetic and produced oxygen. 7. An oxygenated atmosphere capped by the ozone layer protected Earth. 8. First eukaryotes may have been communities of prokaryotes. 9. Multicellular eukaryotes evolved. 10. Sexual reproduction increased genetic variability, hastening evolution. WebThe origin of the reptiles lies about 320–310 million years ago, in the swamps of the late Carboniferous period, when the first reptiles evolved from advanced reptiliomorph …
Reptile - Evolution and fossils Britannica
Webwhen did the mass extinction of dinosaurs happen? end of the mesozoic era. in which time period did Pangea appear? precambrian era. in which time period and era did the first fishes with backbones appear? silurian period of the paleozoic era. in which time period did the first flowering plants evolve? Web4 feb. 2011 · See answer (1) Best Answer. Copy. Mammals first appear in the fossil record of the Mesozoic Era. Wiki User. ∙ 2011-02-04 14:19:05. sharon dietrick
Evolution of birds - Wikipedia
WebThe Evolution of Archaeopteryx. In 1861, paleontologists discovered the first recorded fossil of Archaeopteryx Lithographica, named by geologist Sir Richard Owen, in the “Solnhofen Limestone” deposits in southern Germany. Archaeopteryx is considered by many to be the first bird, being about 150 million years old. Web20 jan. 2024 · First came the Precambrian period, which stretched from the earth’s formation to about 542 million years ago. The development of multicellular life ushered in the Paleozoic Era (542–250 million years … Webin which time period did the first birds appear? jurassic period of the mesozoic era. in which time period did the first human ancestor appear? tertiary period of the cenozoic … sharon dillard facebook