Answer:
Is this a question about the topic of biology
The brain region identified lighting up during an fMRI scan in a patient with obsessive-compulsive disorder is the anterior cingulate cortex. The anterior cingulate cortex is part of the limbic system and is responsible for the emotion formation, memory, processing, compulsions and obsessions, and others.
larger and cooler I think or larger and warmer
Toxins in the soil would enter through the root system first.