<span>A system for conducting a scientific investigation
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I'm assuming this is referring to the Peppered Moth, a species of moth that adapted to the change of color on tree bark. The tree bark changed color as a result of local pollution. The moths (over the course of generations) changed color as well that better suited camouflage upon the new color of the tree bark.
Aspen is where trees make up the largest organisms on Earth
Answer: I would say the answer is A: Symbiotic.
hope you find this helpful (:
i apologize if i got it wrong
