The layers above would be not as old and the layers below would be the older layers.
the answer should be (.A.)
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Answer:
50% slipper footed, 50% non-slipper footed
<span>Sodium channels close when not occupied
</span><span>Sodium ions diffuse through and enter the cell.
</span>
Then they leave the cell.
The sodium diverts in the cell layer have receptor locales for acetylcholine.
