1. define fitness as it used to describe adaptation(11.3).

If an organism is fit it is able to adapt to its environment in order to survive, if it is unfit, it cannot adapt and will die

Ui do not known man just trying to answer my first question

Nimbostratus is the correct answer.
explanation: nimbostratus clouds are the type of clouds that are mostly likely present on gray, rainy day. these clouds produce continuous rain, snow and there is no thundering or lightening either.