The tully-fisher relation holds that the a spiral galaxy rotates, the it is.

Faster / more luminous thats your correct answer.
 

hoped it helped !

Answer(a); // soil salinization and waterlogging;

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!