Variety of life
As soon as life began, it started to change. Living things thrive by making copies of themselves, but the copies are not exact. Over time , the differences generate new forms of life.
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This process of change, called evolution , has created the diversity of life on Earth.Evolution- Every living thing is slightly different from its parents. If the difference helps it to survive, it is likely to pass on the advantage to its own young. This is the basis of evolution. Many years later, it may lead to a change that is large enough for the result to be called a different species.
Natural selection
The main mechanism of evolution is called natural selection. Life in the natural world is a competition, with losers and winners. Those that survive and breed happens to have a combination of qualities that helps them thrive in theirhabitat. But if conditions change, the winners may turn into losers. Survival of the fittest-Most peppered moths have pale wings for camouflage. But a darkform thrived in places with smoke-blackened trees because it was less obvious to birds
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