Blood cells are produced in the bone marrow and the bone marrow is part of the skeletal system. So the answer would be skeletal system<em>. </em>
I think its 20, we briefly covered this in class
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It is called making a PREDICTION.
Prediction refers to an act of forecasting about a particular matter. In scientific investigation, to predict means you are explaining what is going to be the likely results of the experiment which you are about to carry out. Your prediction might be wrong or right.<span />
They left so it would be emigration. Hope that helps!