Why are common names not a good reference to a species

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

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