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Evolution is the process by which life has changed over time. This includes changes within species and the formation of new species. Evolution is based on a variety of evidence, including the fossil record, comparative anatomy, embryology, and molecular analysis.

Which of the following statements about evolution is supported by evidence?


All modern species have arisen from previous forms and continue to evolve.


Almost all modern species evolved from other modern species.


The original prokaryotic species that arose over 3 billion years ago are still existing today.


The total number of species on Earth is always increasing.

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