Which of the following must be true for heat to flow from one substance to another? a. one oneonta the substance must always be a solid. b . one of the substance must always be a liquid. c. the substance must be at the same temperature d. the substance must be at different temperature

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.