Describe the probable effects on an ecosystem if all the plants were to die

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks