How is the y chromosome different from the x chromosome?

y chromosome is responsible to determined the sex of the child

x chromosome don't determined the Sex of the child

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.

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