Final answer:
There are 13 different vitamins that are considered essential for human life, such as Vitamin A, B9, and K.
Step-by-step explanation:
Vitamins are organic compounds that the body needs in small amounts to function properly. Humans need 13 different vitamins. Some examples are Vitamin A which helps maintain good vision, Vitamin B9 which helps form red blood cells, and Vitamin K which is needed for blood to clot.