What is a chronic autoimmune disease where the body produces antibodies that stick to the body's own cells causing the body to attack itself?

Which phrase is most likely to start a description of a scientific theory? “what i have found through my online research is . .” “after much thought, i believe that the best explanation is . .” “based on the observations made and experiments performed over the last fifty years . .” “if sunlight shines on the right side of a plant, then the plant will grow toward the right because . .”

Which would be the most useful source of evidence to support mcneill's contention?

Which step is not included in the step approach to calculating the greatest common divisor?