Identify each type of reaction. Single replacement, synthesis, decomposition, double replacement, and combustion

Ithink its solid. hope this

This is a solution, hope i could

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.

I'm pretty sure its c