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Evolution of Seed Plants
Welcome back. This process, performed by algae and other microorganisms, caused oxygen molecules in water to be released into the atmosphere. Prior to oxygenic photosynthesis, Earth's atmosphere had no free oxygen, a huge impediment to the evolution of life. The Proterozoic eon began about 2. During this period, the Great Oxygenation Event transformed the Earth's atmosphere, allowing for the evolution of aerobic organisms.
The Proterozoic was also the period in which the Earth's first glaciers formed. Some scientists even believe that during the Neoproterozoic era, about million years ago, the surface of the Earth became frozen. Proponents of the "Snowball Earth" theory point to certain sedimentary deposits that are best explained by the presence of ice. The first multicellular organisms developed during the Proterozoic eon, including early forms of algae.
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Fossils from this eon are very small. Some of the most notable from this time are the Gabon macrofossils, which were discovered in Gabon, West Africa. The fossils include flattened disks up to 17 centimeters long. The most recent geologic eon is the Phanerozoic, which began about million years ago.
This eon is very distinct from the previous three—the Hadean, Archean, and Proterozoic—which are sometimes known as the Precambrian era. During the Cambrian period—the earliest part of the Phanerozoic—the first complex organisms appeared. Most of them were aquatic; the most famous examples are trilobites, small arthropods creatures with exoskeletons whose distinct fossils are still being discovered today. During the Ordovician period, fish, cephalopods, and corals first appeared; over time, these creatures eventually evolved into amphibians and dinosaurs.
During the Mesozoic era, which began about million years ago, dinosaurs ruled the planet. These creatures were the largest to ever walk the Earth.
Titanosaur, for example, grew up to feet long, five times as long as an African elephant. The dinosaurs were eventually wiped out during the K-2 Extinction, an event that killed about 75 percent of the life on Earth. Following the Mesozoic era was the Cenozoic, which began about 66 million years ago. This period is also known as the "Age of Mammals," as large mammals, following the extinction of the dinosaurs, became the dominant creatures on the planet.
In the process, mammals diversified into the many species still present on the Earth today.
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Early humans, including Homo habilis , first appeared about 2. These enormous changes to life on Earth have taken place over a period of time that, compared to geologic history, is relatively small. Human activity has transformed the planet; some scientists have proposed a new epoch, the "anthropocene," to describe this new period of life on Earth.
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