Acollege student has been experiencing frequent headaches that he describes as throbbing; he is reporting difficulty concentrating while studying. upon cerebral angiography, he is found to have an arteriovenous malformation. which pathophysiologic concept is likely responsible for his symptoms

High pressure and local hemorrhage of the venous system.

Explanation:

Cerebral angiography may be defined as medical diagnostic technique that uses the Xray for the production of image. Any blockage can be diagnosed by this technique.

The arteriovenous malformation can cause severe headaches. This condition might occur due to the high blood pressure and difficulty in blood flow in the brain and body. Any hemorrhage in the body especially in the venous system might result in arteriovenous malformation.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.