Cell membrane control the entry and exit of the cell . cell membrane even seperate external environment from the internal cell. gates seperate our house from roads , even gate controls entry and exit . in this way cell membrane and gates are similar
Selectivity permeable membrane and a scaffold for biochemical activity
Answer:
Trough my nebourhood it starts in the local pond when the sun hits it evaportes and then it will make clouds then it rains next it flows trough the sewers and it will make it back to the pond
Explanation:
Have the blood closed at all times with ing vessels of different size and thickness