Question: Which of these is the most likely hypothesis that guided the students' studies?
A grain diet is high in available carbohydrates.
Harmful E. coli bacteria can be killed by heating and irradiation.
Cattle that are fed a grain rich diet have a colon pH that is lower than those fed a hay rich diet.
Cattle that are fed a grain rich diet have a larger amount of harmful E. coli bacteria in their digestive tracts.
