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Answer:
Your heart is actually a muscular organ. An organ is a group of tissues that work together to perform a specific function. In the case of your heart, this function is pumping blood throughout your body. Additionally, the heart is largely made up of a type of muscle tissue called cardiac muscle.
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B.Second-hand smoking this also means the air is being breathed in by another person.
Answer:
I believe your first two are correct but your bottom two should be rearranged. Have you tried looking it up?
Explanation: