Answer is D) low-gravity.
Why? Because all outer planets are made up of gas, so C is not it, outer planets are way more bigger than inner planets, so A is not it, and Jupiter, Saturn, Uranus, and Neptune are outer planets, so B is not it. So D is the right answer!
Hope this helped!
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Answer:
Scientists found evidence such as fossils that were almost 4 billion years old, concluding that life on earth began after that.
Explanation:
Repolarization
Reaching the threshold
Depolarization
Answer:
Option B - Repolarization
Explanation:
The change in the membrane potential to a negative value just after action potential is known as repolarization phase.
In cell, the depolarization event allows sodium channel to open. The cell after a short period of time allows the event of repolarization. The repolarizationevent occurs due to outflow of K+ ions. Thus, a damaged neuron will prevent the repolarization event.