Over about a billion if you are an adult, over about a trillion if you are a kid or teenager(since are more active and young),and about over a million if you are older than 75 or 80(depends on your health).
The child should only have one heartbeat.
Depends how fit you are.
.4
5
Around 20
One human year is the equivalent to 7 dog years.
The popular comparison is one human year equals seven dog years.
One way valves prevent backwash between heartbeats.
wonder how many years are in one human year it is...7 and there you have it that's your answer 7 is dogs. around 9 to 15 but it depends on the breed.
On average, 1 human year is equivalent to about 7 cat years. This ratio can vary depending on the breed of the cat and its health.
No not necessarily
I'm pretty sure you can't tell the sex of unborn babies by their heartbeats...