2. Where was the sun in relation to Earth when the astronaut took this photo?

The answer is b because a,c,and d are opinons

Ireally don’t know this

A, it is falling action my have a good day

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.