A shared derived characteristics is usually a homologous structure, such as a backbone, that is shared by all organisms in a group.
I would answer B!! But your guess is as good as mine!!
Answer:
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<em>m = </em><u><em>25</em></u><em> </em><em> </em><u><em>Kg</em></u>
Answer:functional group (top row); sources in nature (bottom row)
Explanation: