Name two situations in which a cell would need to use active transport instead of diffusion?

I no one reason is If I ions are moving through the cell

This energy comes from the molecule ATP,which stores energy in a form that cells can use

To transport protein to specific areas of the cell, e.g. the synaptic terminal of a neuron's axon; and to transport ions & chemicals against their concentration gradients

well an example would be when something was active it could be transported? IDK!

To transport protein to specific areas of the cell, e.g. the synaptic terminal of a neuron's axon; and to transport ions & chemicals against their concentration gradients