what caused the changes in forms of life

Adaptations develop from variations within a population and help organisms to survive in their given environment. Changes in populations accumulate over time; this is called evolution. The fossil record shows us that present day life forms evolved from earlier different life forms. As living things evolve, they generally become better suited for their environment. This is because they evolve adaptations.

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Adaptations develop from variations within a population and help organisms to survive in their given environment.

Changes in populations accumulate over time; this is called evolution. The fossil record shows us that present day life forms evolved from earlier different life forms.

Plate tectonics shift the continents, raise mountains and move the ocean floor while processes not fully understood alter the climate. Such constant change has characterized Earth since its beginning some 4.5 billion years ago.

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