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Has evolution ever been observed, tested, and repeated?

Answer 1

No.

While adaptation has been observed on individual organisms, evolution is a multigenerational process that occurs throughout a population and cannot be directly observed. Generally speaking, adaptation is a newly acquired trait that increases an organism's fitness in a specific environment.

Berkeley provides an excellent explanation here.

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Answer 2

Lydia Adams

Evolution has been observed in various ways, such as in laboratory experiments with bacteria and in studies of natural populations. It is tested through fossil evidence and genetic studies. The process has been observed and tested but not repeated in the same sense as controlled experiments due to the long time frames involved.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.