Easy. Answer is oxygen because it says which one was missing before any life was on earth. And in order to have life on earth you need oxygen!
:)
Your spinal cord works like a Telephone wire, sending messages back and forth between your body and your brain.
Reference point .................................
Hey there!
I believe the answer you're looking for is radio wave
Hope this helps!
Answer:
I believe the answer is A
Explanation:
I think it is A because the original function of the spinal cord is to complex organization of nerve cells responsible for movement and sensation. It carries signals between the brain and the rest of the body.
