Sorrowful mood is described a sad feeling, especially when it involves grief or loss. For example- the loss of a thing one loves the most, the loss of a loved family member etc.
So, here in these lines of the poetry, the last line describes the sorrowful mood of the poet.
"branches droop as gray skies loom" .
Organs, cells with the same function make up tissue and tissue makes up the organ
The best and most correct answer among the choices provided by your question is the third choice or letter C.
Human activity is the primary cause of the rapid rise in loss of biodiversity.
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Both planets have retrograde rotation. hope this helped <3