Answer:
Nucleus
Explanation:
The nucleus stores hereditart material and coordinates activities of the cell
Displacement is shortest distance from starting point, 4km.
Then the model will become useless. originally the bottle should be air tight only tubes connected to the balloons, so that pressure can be shown when you adjust the plastic sheet in the bottom of the model. but now if there's a hole, air can move freely in or out the bottle and the model will not be able to show anything that occurs during respiration
