The two main branches from the trachea (one to each lung)
1)bronchi
2)capillaries
3)alveoli
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Alpha particles, also called alpha rays or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways.
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The answer is a) bronchi
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