Diffusion of oxygen from an alveolus into a pulmonary capillary belongs to which aspect of respiration?

you keep track of variables in your data table.

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.