The number of new infants per one thousand individuals in a population per year is the birthrate
Answer:
Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA.
Explanation:
The mesosphere is the coldest layer of the atmosphere.
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