1) contour interval of this map 2) Observe the map and give elevation of points.
A:_ B:_ C:_ Y:_
3) Record the differences between A and B:_ , C and Y:_

All cells need water to survive. in order to maintain the necessary amounts, water can flow across the cell membrane from areas of higher concentration to areas of lower concentration. what is this flow of water called? a) active transport b) allocation c) diffusion d) osmosis