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One Life to Live (often abbreviated as OLTL) is an American soap opera broadcast on the ABC television network for more than 43 years, from July 15, 1968, to January 13, 2012, and then on the internet as a web series on Hulu and iTunes via Prospect Park from April 29 to August 19, 2013.
The history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to present day.
- Simple organic molecules were formed. Simple organic molecules, similar to the nucleotide shown below, are the building blocks of life and must have been involved in its origin.
- Replicating molecules evolved and began to undergo natural selection. All living things reproduce, copying their genetic material and passing it on to their offspring.
- Replicating molecules became enclosed within a cell membrane. The evolution of a membrane surrounding the genetic material provided two huge advantages: the products of the genetic material could be kept close by and the internal environment of this proto-cell could be different than the external environment.
- Some cells began to evolve modern metabolic processes and out-competed those with older forms of metabolism. Up until this point, life had probably relied on RNA for most jobs (as described in Step 2 above).
Home Science Biology. Evolution and the history of life on Earth. Heritability. major evolutionary events. The geologic time scale from 650 million years ago to the present, showing major evolutionary events. (more) The evidence is overwhelming that all life on Earth has evolved from common ancestors in an unbroken chain since its origin.
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The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence , mainly fossils .
Jul 14, 2009 · Timeline of the evolution of life on Earth | New Scientist. Life. Timeline: The evolution of life. The story of evolution spans over 3 billion years and shows how microscopic single-celled...
Life - Origin, Evolution, Abiogenesis: Perhaps the most fundamental and at the same time the least understood biological problem is the origin of life. It is central to many scientific and philosophical problems and to any consideration of extraterrestrial life.
