The substance that is predominately absorbed in rain forests would be carbon dioxide, I believe. As many tropical trees are present and will uptake CO2 to synthesize glucose or sugar as a product of photosynthesis.
The serotoninergic nuclei of the diffuse modulatory system have a role in pain an locomotion. Specifically, the Magnus raphe nucleus is a part of the motor system in the brain and has a role in mediating pain.
Together with the cerebellum, it has a role in regulating movement and its connection to the spinal cord enables it to inhibit pain.
The awnser is C. Because I belive those are all functions
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Answer:
The feeding relationships among the species in a community determine the community's trophic structure. C)