Kima is an athlete and weighs more than her sister, who is of the same height. what could be the reason?

There are multiple reasons for this. Theres the obvious one that Kima may have more fat than her sister, but considering she is an athlete I don't think that is the case. I would say that Kima has more muscle mass than her sister. Muscle weighs more than fat so often times an athlete will way more than a nonathlete