Answer:
An external stimuli is a stimulus that comes from outside an organism and causes a reaction.An internal stimuli is a stimulus that comes from inside an organism.
It's A. volume
Pressure =

with const depends on the chosen unit of volume
I think so...
32 electrons. as the orbitals get father away from the nucleus, they hold more electrons.
Glycolysis yields 2 ATP molecules, Krebs cycle yields 2 ATP molecules, ETS yields 34 ATP molecules.