The answer to your question is,
D. Can cause ulcers
-Mabel <3
D. Neurons everything else is a connective tissue, mainly bones and blood. Have a good day
The human body contains trillions of cells. each organ belongs to one of 10 human body systems, these body systems are interconnected and dependent upon one another to function your heart does not beat unless your brain and nervous system tell it to do so your skeletal system relies on the nutrients it gains from your digestive system to build strong and healthy bones
