it’s important the lungs stay elastic in nature so that gas exchange can take place in the alveoli in the lungs. provide one disease caused by smoking and how it affects the process of gas exchange.

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.