To enlarge crops or mix types for a different flavor ,pest control,or if a type of vegetable is fading away
It is controlled by negative feedback loop.Let's say you have high glucose level in your blood,that will be registered and pancreas will produce more insulin to keep it in the normal range.Therefore by negative feedback loop it will regulate homeostasis
An egg is fertile when it ovulates. That's three days so male sperm gets to the egg quicker but it dies quicker too. So if couples have sex before ovulation by the time the egg is fertile the male sperm is dead which leaves the female sperm. This is why there may be more women than men.
