A fishing pole with a reel and a hook on the end is considered a complex machine. What simple machines are included? (I'm looking for 3)

They can measure  the amount of energy gained or lost

Each calcium ion has a charge of +2, which can also be written as ca2+. if those ions move out of the neuron and no other ions are moving, the neuron would lose the positive charge associated with those ions and become more negatively charged.

#2- the hno3 has a h+ ion and the naoh has an oh- ion

I'm pretty sure its c