D, A
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<span>It is common for some toddlers to be very shy and not be sociable. This is due to the fact that they may not have any other siblings at home and do not get out much. The fact that other children play just fine is not alarming as everyone is different than others.</span>
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Answer:
the central part of the cell containing DNA and RNA and responsible for growth and reproduction - contains the nucleolus, chromatin, and nucleoplasm
Um not sure if this is correct or not (trying to remember from last year) but you would analyse the evidence, try to make an interence, fork a hypothesis and then test that hypothesis with an controlled experiment