Origin of Life

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by justinw12344
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Origin of Life

Origins of Life

In radiometric dating, scientists look at the ratios of naturally occuring radioactive isotopes (atoms that carry an electrical charge) found in igneous rocks. These unstable radioactive isotopes decay to non-radioactive elements at constant rates, known as the element's half-life.

Index fossils are certain fossils that lived for a short period of time but covered a large area, so If you found an index fossil and knew the time period over which it lived that would be the same age of rock. Index fossils help correlate rock layers around the world.

Precambrian events include earth's formation, atmosphere formation, ocean formation, start of life.

The Paleozoic is bracketed by two of the most important events in the history of animal life. At its beginning, multicelled animals underwent a dramatic "explosion" in diversity, and almost all living animal phyla appeared within a few millions of years. At the other end of the Paleozoic, the largest mass extinction in history wiped out approximately 90% of all marine animal species.

During the Mesozoic, the Earth was very different than it is now. The climate was warmer, the seasons were very mild, the sea level was higher, and there was no polar ice. Even the shape of the continents on Earth was different; the continents were jammed together at the beginning of the Mesozoic Era, forming the supercontinent of Pangaea, but would start breaking apart toward the middle of the Mesozoic Era.

The Cenozoic Era is divided into two periods, the Paleogene and Neogene which are divided into epochs. The Cenozoic has seen the extinction of the non-avian dinosaurs and the rise of mankind. It is marked by the Cretaceous-Tertiary extinction event at the end of the Cretaceous period and the end of the Mesozoic Era. This era is the era of new life. Mammals may not have risen from the oceans at this time, but they did evolve into a diverse collection of terrestrial, marine, and avian forms.

Panspermia is the theory that microorganisms or biochemical compounds from outer space are responsible for originating life on Earth and possibly in other parts of the universe where suitable atmospheric conditions exist. Essentially, it is a hypothesis which states that life on earth came from outer space.

Biopoiesis is a process by which living organisms are thought to develop from nonliving matter, and the basis of a theory on the origin of life on Earth.


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