Well red blood cells carry oxygen to muscles
Circulatory system is probably the answer you are looking for.
A is your answer.
On the periodic table the atomic number is the number of protons inside the nucleus.
Hello!
Find the Energy of the Photon by Planck's Equation, given:
E (photon energy) =? (in Joule)
h (Planck's constant) = 
f (radiation frequency) =
Therefore, we have:





I Hope this helps, greetings ... DexteR! =)