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The DNA in our cells is susceptible to damage as a result of exposure to harmful radiation or to ____1____ mutagens. Excess exposure to ___2____ radiation within sunlight, for example, or to tobacco carcinogens induces harmful changes in our DNA. However, the most frequent changes in the base sequence of our DNA arise from _____3____ sources, arising from proximity to harmful chemicals within our cells, notably ____4____ ____5____ ____6____ , and as a consequence of occasional errors in various ____3____ mechanisms, such as DNA ____7____, DNA ____8____ , and chromosome ____9_____.

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The Answer of Fill in the blanks below.
The DNA in our cells is susceptible to damage as a result of exposure to harmful radiation or to ____1____ mutagens. Excess exposure to ___2____ radiation within sunlight, for example, or to tobacco carcinogens induces harmful changes in our DNA. However, the most frequent changes in the base sequence of our DNA arise from _____3____ sources, arising from proximity to harmful chemicals within our cells, notably ____4____ ____5____ ____6____ , and as a consequence of occasional errors in various ____3____ mechanisms, such as DNA ____7____, DNA ____8____ , and chromosome ____9_____.

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