Explain evolution of different Life forms.(limits 500 words)
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Answer:
The evolutionary history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to the present. The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor. Origin of life means the appearance of simplest primordial life from non- living matter. Evolution of life means the gradual formation of complex organisms from simpler ones.
different theories of evolution:
2.1 Vitalism.
2.2 Theistic evolution.
2.3 Orthogenesis.
2.4 Lamarckism.
2.5 Catastrophism.
2.6 Structuralism.
2.7 Saltationism, mutationism.
2.8 Genetic drift.
The first living things on Earth, single-celled micro-organisms or microbes lacking a cell nucleus or cell membrane known as prokaryotes, seem to have first appeared on Earth almost four billion years ago, just a few hundred million years after the formation of the Earth itself.
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