Organ Systems. When a group of organs work together to carry out a body function this is the what it is called.
Integumentary system. This is the external covering of our body, our skin.
Skeletal System.
Muscular System.
Nervous System.
Endocrine System.
Cardiovascular System.
Lymphatic System.
I would say making sure I get plenty of rest and water/food which is the top self care priorities
The answer to your question is 1 billion
it can be used to help repair broken DNA, even when the break involves both strands of the double helix.
Im an overthinking person to.. If you need someone to talk to or vent to even/if than Im here ^^