This belief is incorrect because not all mutations are harmful. Here's a simple explanation:
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Types of Mutations: Mutations can change the DNA, but they come in different types. Some mutations have no effect at all, some are beneficial, and only a few are harmful.
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Neutral Mutations: Many mutations are neutral, meaning they don’t affect how the body functions. These changes can happen in parts of the DNA that don’t control important traits.
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Beneficial Mutations: Some mutations can be helpful. For example, they might give an organism better resistance to disease or allow it to adapt to its environment.
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Checks and Balances: Our bodies have mechanisms to fix or ignore many harmful mutations. Cells can repair their DNA or eliminate cells that become dangerous.
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Cancer and Tumors: While some mutations can lead to cancer, many cells in our body can mutate without leading to tumors. Most cells are controlled and regulated to prevent uncontrollable growth.
In short, mutations are a natural part of evolution and can result in a variety of effects, not just harmful ones.