which change would usually increase competitions for food among squirrels populations in a certains areas ?

growth of birth rate if I'd high

Explanation:

when ever the growth and birth rate become high there is need for more food among squirrels

passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input. unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

so, according to what that says, i believe it's hypertonic and hypotonic.

good luck!