Name a few important body functions that your nervous system controls on its own without you having to think about it much

They belong to the autonomic nervous system and are controlled by the sympathetic and parasympathetic nerves. These body functions include;

Breathing

Digestion

Heart rate

Reflex action

Sneezing

Sexual arousal

The autonomic nervous system is responsible for fight-or-flight response, rest and digest", and "feed and breed" systems

sex cells are usually half's then they find another half and make a fertilize egg