Urea diffused in all regions of the filter during countercurrent flow. using what you know about the sizes of urea and potassiu, which graph shows what would happen to potassium during countercurrent flow? diffuse in all regions of the filter or diffuse until equilibrium is reached in regions iii, iv, v.

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.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

your answer is going to be physical weathering