2. During digestion in the stomach, the concentration of hydrogen (H ) ions rises to many times the concentration found in the cells lining the stomach. Using concepts of molecular movement and transport, explain how the cells lining the stomach could cause ions to move against their gradient to produce this result, and what type of molecule in the cell membranes would be responsible.

What evidence could be used to convince policy makers to change a shipping lane from going through a whale breeding ground? information on the number of all whale species currently alive information on the number of all whales hit by boats in the given area information on the number of whale deaths in the world's oceans information on the number of whale offspring born every year. (a) scientists could collect and combine data on fish populations all around the world to show that their populations are declining. (b) scientists collect and combine data on fish populations all around the world to show that their populations are increasing. (c) scientists work together and use past data to show that fish populations are becoming locally extinct in some areas. (d) scientists work together and use past data to show that some fish populations are adapting to environmental changes.