Answer:
It could be multiple things from stress to impatience or if your worrying about something and your anxious about it.
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Mutation causes change in an organisms DNA, resulting in a change in all aspects of the organisms life. It affects how the organism looks, and how it behaves. If there was no mutation, an organism could not change, therefore there wouldn't be evolution at all.
Answer:
have different strength .......
D. Use the metric system when communicating procedures and results