If everything in the universe is physical, then this means that the mental processes and subjective mental experiences of our mind must also be entirely physical processes taking place in an entirely material brain. Using this fundamental assumption of the modern scientific view of the universe, this means that the mind is entirely material, dependent upon the physical activities of an entirely material organ, the brain.
This is an obvious but interesting statement. Our brains are physical material and all thoughts, feelings and actions are a result of physical functioning. What makes us any different from a machine then?