Resistance to disease is dependent largely on the body's:

The correct answer is immunity.

Explanation:

Immunity is the resistance of the body to fight against any infection or disease. Immunity can be innate or adaptive. Innate immunity is birth born immunity that means it is present from birth. It is the first line of defense.

Adaptive immunity generate with the second encounter of a pathogen due to the memory generated during its first encounter. Innate immunity works on all type of antigens that means it is non-specific while adaptive immunity is specific immunity.

Both immunity are responsible to protect the body from pathogenic organisms. Innate immunity works faster than adaptive immunity. Adaptive immunity generally contain antibody-secreting cells.

i'd say that the moon rock is about 2.2 billion years old.