Well Sertoli cells<span> keep the germ </span>cells<span> that start the process healthy and nourished. </span>
<span>A dog meets all the characerisitcs of life in the following ways - they maintain homeostatis, are made of cells, breathe and have a metabolism, are able to reproduce, pass their traits off to their offspring, they grow and change, and and respond to their environment.</span>
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An embryonic stem cell is the first cell in the embryo, this is what creates a human and helps more cells to form.