Which of the gastrointestinal cancers has the highest rate of incidence and is responsible for the highest number of deaths?

The correct answer is colorectal cancers.

After lung, breast and prostate cancer, colorectal cancer is the fourth most common cancer in the last year. Colorectal cancer is a disease of old age: It usually originates in the secretory cells of the gut. One of the main risk factors is unbalanced diets (low in vegetable fibre and high in fat ).

this is a good question! i'll do some research and come back when i have the answer!

not sure if this is what you'r looking for eubacteria and archaebacteria