I think it might be Stratosphere, if Ozone layer is an option I will suggest that too.
Answer: 3
Explanation:
All elements in group 3 have 3 levels of energy.
Na (sodium) has 3 valences the inner has 2 electrons, the middle has 8 electrons and the outer has 1 electron.
This will continue across the group 3 adding one more electron to the outer valence until Ar (argon).
Remember the Octet rule of 8..?
Answer:
I believe its muscle cell, muscle tissue, stomach
Explanation:
The order for organ systems from least complex to most complex is: Cell, tissue, organ, organ system. Hope this helps