If you add the amount of protons with the amount of neutrons, you get the atomic mass. Sodium has 11 protons, and 12 neutrons. 11+12=23
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Answer:
Label A is the amino group
Label B is the R group
Label C is the carboxyl group
Explanation:
The answer would be D, 7 hours of sleep
<span>The ecosystem is the lowest level of the biosphere hierarchy to include weather patterns and soil conditions.
in the whole biosphere hierarchy, ecosystem actually placed as the second highest (1 place below biosphere)
But there are only 2 hierarchy that include weather and soils, and those hierarchies are biosphere and ecosystem. So technically the ecosystem will be the lowest in this matter</span>
