Most mutations are caused by ........

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(A) Mutations are sudden changes in the genetic material of an organism. Physical mutagens are agents that cause mutations,and among the options provi

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$UV$ rays

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(A) Mutations are sudden changes in the genetic material of an organism. Physical mutagens are agents that cause mutations,and among the options provided,$UV$ rays (ultraviolet radiation) are the most common physical mutagens that cause damage to $DNA$ by forming pyrimidine dimers. $Alpha$ and $Beta$ rays are ionizing radiations,but $UV$ rays are more frequently associated with environmental mutagenesis in biological systems.

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