What is the name of one of the lower chambers of the heart that receives blood from the upper chambers and pumps it into the arteries?
a.
atria
b.
valves
c.
arteries
d.
ventricles

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

Iknow the answer is a but i don't know why

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k