Answer:Referring to the fact that a neuron either fires completely or does not fire at all.
Explanation:
Hello.
The answer is: A. keep a cork in the test tube so the solution cannot spill out
B and C both could be very deadly and it shouldnt be D because if u have an open flame you shouldnt open it even if its not towards anyone.
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22.4 molecules are in 4.48 liters of CO 2