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Yes, 80bpm is a healthy resting heart rate.
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normal resting heart rate is usually somewhere between 60 and 80 bpm. if its much higher than that resting and constantly see a doctor.
No, because if you have a lower resting heart rate you are usually healthy, but it can depend on the person.
Depends if you're a rabbit, a cat, a lizard or a pig. As for humans - The typical healthy resting heart rate in adults is 60-80 bpm