Nervous: ; ; respiratory : lungs? a. muscles b. brain c. heart d. arteries

The answer is (B) Brain. This is because the brain is a part of what is known as the nervous system just as the lungs are part of what is known as the respiratory system.

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes