Some molecules diffuse through cell membranes, but many others cannot. A membrane that allows some, but not all, molecules to pass through it is
called
A. permeable
B. semipermeable
C. impermeable
O D. nonporous

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

i believe your answer would be c.. : )

airlines i think? or a cruise boat? does this work out for u? ?