Answer:
Photosynthesis relies on sun, water, and CO2 for it to make food. When there are lower levels of either, the organism carrying out photosynthesis can't make as much glucose and oxygen. This in turn harms the organism.
Answer: An "interface" .
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A sharp, stinging odor would most likely be a defense mechanism for a plant.
The corpus callosum, a tight region of axons (whitematter), is the direct connection and thus communication between left and right hemispheres.
A "split-brain" could result from disruption of or damage to the corpus callosum, either in part or whole.