Choosing to not use tobacco is the start to leadership and control over how you want to live the rest of your life. You stay looking young, healthy, and you're not at high risk for developing cancer in your heart or lungs. Many tobacco users age quicker, lose their voice, develop cancer, have severe kidney problems, and can even result in death.
That's my answer :) hope it works!
Explanation:
In humans, the sex of the baby is determined by the sperm. The sperm gamete is heterogamatic because approximately half of them contain the X chromosome which will result in a girl and approximately half of them contain the Y chromosome which will result in a boy.
Sinotrial node or the SA node
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