Where are the following structures located?
(i) Bun dle of His
(ii) Bi cus pid valve
(iii) SA node
(iv) Alveoli
(v) Parotid gland
(vi) Malpighian tu bule
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Explanation:
1. , 2. , 3. - heart
4.in lungs
5. in mouth
6. in insects for excretion
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