Answer:the decline of lichens is an important indicator of an imbalance in the ecosystem. this research can help system ecologists predict how pollution will affect the entire ecosystem
Explanation:
Yes it is C but for future reference, both A and B are referring to solids, and D is referring to a gas, hope this is helpful later!
My best guess is C not sure tho
The axial skeleton inclueds the
answer: A. vertebra, skull, and ribs.
