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MariettaO [177]
3 years ago
8

What happens when sand and gravel roll along a river bed?

Biology
1 answer:
Alenkinab [10]3 years ago
8 0
It serves as a barrier to biological activity. 
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Over our lifetime, our DNA can undergo changes or mutations that result in differences in the DNA sequence and may affect the proteins that are made. Mutations can occur as a natural consequence of errors in DNA replication or as a result of exposure to environmental factors such as smoking, sunlight or radiation.

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Between 225 and 325 grams of carbohydrates a day.

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