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Biology Chapter 17 Section 3 Evolution of Life
Transcript of Biology Chapter 17 Section 3 Evolution of Life
fish. Hominid Species Mesozoic Era Jurassic Period
Dinosaurs became the dominant animals on land.
One of the first bird-like reptiles, Archaeopteryx, appeared.
Birds are now known to be close relatives of dinosaurs. The Paleozoic Era is divided into the following periods:
Permian Paleozoic Era Crinoid Rich fossil evidence shows that early in the Paleozoic Era, there was a diversity of marine life. Paleozoic Era The fossil record indicates that mammals
were large meat-eaters that caused the extinction of the dinosaurs.
appeared in the Triassic Period but did not flourish until the dinosaurs became extinct.
successfully competed with the dinosaurs because they protected their young.
are the ancestors of modern birds. Coal was formed over millions of years from sediments deposited during the
Permian Period. The first vertebrates to appear were the
reptiles. During the Cenozoic, mammals evolved adaptations that allowed them to live in various environments—on land, in water, and even in the air. Cenozoic Era The mass extinction at the end of the Paleozoic affected both plants and animals on land and in the seas. As much as 95% of the complex life in the oceans disappeared. Paleozoic Era Cambrian Period
The diversification of life at this time is called the “Cambrian Explosion.”
The first known representatives of most animal phyla evolved. These included:
trilobites Paleozoic Era Trilobites Few fossils exist from Precambrian time because the animals were all soft-bodied.
Life existed only in the sea. Precambrian Time Evolution of Multicellular Life The term Cambrian Explosion refers to
the impact of a giant meteor that extinguished much of life on Earth.
the end of the Cambrian Period when many species were replaced by other species.
the first appearance of a great diversity of life representing most animal phyla.
a volcanic eruption that buried many of the fossils of Cambrian age. Cenozoic Era The Cenozoic often is called the Age of Mammals.
The Cenozoic is divided into the two periods:
Quaternary Period The Cretaceous Period ended with a mass extinction.
More than half of all plant and animal groups were wiped out, including all of the dinosaurs. Mesozoic Era Archaeopteryx During the Mesozoic Era, dinosaurs became dominant. The Mesozoic Era is often called the Age of Reptiles.
The Mesozoic is also marked by the appearance of flowering plants.
Carboniferous and Permian Periods
Reptiles evolved from certain amphibians.
Winged insects evolved into many forms.
Giant ferns and other plants formed vast swampy forests. Remains of ancient plants formed thick deposits of sediment that changed into coal over millions of years. Paleozoic Era Accumulation of
oxygen Radiation of mammals First eukaryotes First multicellular organisms First land plants Cenozoic Era
Precambrian Time First prokaryotes First humans Clock Model of Earth’s History Geologic Time Scale http://www.paleoportal.org/index.php?globalnav=time_space§ionnav=period_map&period_id=17 Crinoid and Trilobite Mesozoic Era 45 Ma