duolingocom4
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please help THIS IS FOR A GRADE AND WILL BRING MY GRADE ABSOLUTELY DOWN IF I DONT FINISH IT ALSO, I GOTTA COMPLETE IT BEFORE TUTORING

please help THIS IS FOR A GRADE AND WILL BRING MY GRADE ABSOLUTELY DOWN IF I DONT FINISH IT ALSO I GOTTA COMPLETE IT BEFORE TUTORING class=

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spencer180115
The darkening of the tree bark caused the dark peppered moth to flourish after the industrial revolution.
supergirlsarah
It’s the darkening of the ground because after the industrial revolution its surroundings were covered in soot and it camouflaged better than before!

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