focuses on controlling waste in order to limit its environmental harm but does not attempt to seriously reduce waste produced

D)can be increased in a closed system

That depends. cause the owl finished it in one lick

It will appear as o2(g) as a reactant 

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.