It's impossible to give right answer to that question as there's no options. But I think that the reason that lets teenagers to engage in risky situations is their parents as they have the biggest influence to children's behaviour.
Answer:
d. the ear drum
Explanation:
In the anatomy of humans and various other tetrapods, the eardrum, also called the tympanic membrane or myringa, is a thin, cone-shaped membrane that separates the external ear from the middle ear.
Mimi, because their heart race increased the most
Refractory Periods (Absolute) The cell cannot accept another impulse because it's still dealing with the last one. Absolutely no stimulus, no matter how strong, will result in another depolarization.
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