It is called coevolution, when two species influence each other's speciation.
Plicae, villi and microvilli increase the surface area for he absorption of nutrients
In the question stated above, it is very likely that the patient is facing receptive or sensory issues. This is clear when he mistakes one stimulus for another. This might be because he sees one thing but can not distinguish it for another, or he's having problems differentiating one tactile stimulus for another. Either way, the system compromised is the patient's sensory system.
