When does the cell have to use active transport

a) when the cell is low on energy

b) when the cell is in a highly concentrated solution

c) to move molecules across the membrane quickly

d) to move molecules across the membrane against a gradient

velocity and height

earthquakes in florida are rare because the state is not located near any tectonic plates. in fact, florida is tied for first place as having the fewest earthquakes of any state. much of florida is limestone and seafloor materials that is not conducive to earthquakes.

explanation: