All elements are made of "atoms", and an atom is made up from 3 basic particles: Electrons are particles with a negative charge :)
A, greater than. Pressure increases the deeper you go.
The troposphere is B.The stratosphere is A.The mesosphere is C.The thermosphere is D.
Citric Oxide activity stimulates vasodilation of cerebral arteries.
d is the answer :
i just guess don use this if your not sure