You don't 'grow' your anus. It is a part of the body that develops whilst the foetus is in the uterus.
No.
Nothing.
Yes, your hair does grow faster while you are sleeping. This is because sleep is necessary to maintain your body. When you're at rest, your body has time to recuperate.
Because
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it makes you body grow maturely faster
Your hair mostly grows faster by you sleeping. By sleeping your body sleeps as well, which your hair can then grow. Your hair cannot grow when your awake, but your body mostly grows when your asleep. So that's all I can give you.
The developing foetus gets everything it needs from the mother via the umbilical cord. That includes food and oxygen (which is dissolved in the mother's bloodstream). The umbilical cord performs a 'gas exchange' which removes waste gasses from the bloodstream of the foetus, and delivers fresh oxygen. The foetus doesn't need to breathe air to grow and survive. Once the baby is delivered, the placenta stops working, and the child take its first breath of air. From that moment, it's dependence on the mother's body stops.
no in the cold as your body needs to regenarate more so it grows faster
Because the brain has to grow.
You grow because cells in your body are being reproduced faster tthan they are dying. COMMON SENSE!!