Based on the given Ka values for acids arrange them in decreasing order of their acidity:*​

7is b8 is d9 is c10 is a11 is d

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

It decreases by 4 is your answer mark brainliest 

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.