<span>Meninges is the structure that would be unaffected by the peripheral nervous system. Since the Peripheral Nervous System or PNS is made up of motor and sensory nerves, then the other optioin would be cancelled out because they are controlled directly or inderictly by the motor neuron. Meninges on the other hand is a tough tissue that is composed of three membranes which cover the brain and the spinal cord.</span>
One reason is that the two kinds of birds live in two different types of environments and also the sharp billed ground finch does not just it plant matter. It feast on the blood of bigger sea birds. This is an adaptation that it has so it does not have to eat plant matter and compete for food