The chronology that is described in the excerpt Wheels of Change by Sue Macy is a life transformed by bicycle ownership. The answer is letter It is shown in the excerpt above that the couple tried their best to help the people in Sri Lanka get on with their lives by helping them own a bicycle which will produce energy at a much lower cost.
Similarities: They are both scientists, they are both wearing lab coats, they are both in a laboratory. Differences: One's a boy, one's a girl, the boy scientist has equipment in front of him, The girl has a door behind her.
