You are on a field trip and are recording the amount of mass in a volume of water. what are you measuring? a) the concentration of bacteria in seawater b) the concentration of dissolved oxygen in seawater c) the concentration of salt in seawater d) the density of seawater

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.