Answer:
A nucleotide consists of three things: A nitrogenous base, which can be either adenine, guanine, cytosine, or thymine (in the case of RNA, thymine is replaced by uracil). A five-carbon sugar, called deoxyribose because it is lacking an oxygen group on one of its carbons
Explanation:
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Stem cells because they are compatible of dividing and renewing themselves after long periods
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Leeches are parasitic because they suck blood not giving any benifit but harm.