this is a bag that churns up the food. it contains gastric juice and hydrochloric acid. gastric juices contains an enzyme that digests protein. the acid kills germs

Stomach

Explanation:Seems like what you are describing is the stomach. It's the first  stage of digestion and uses pepsin an enzyme that digest protein. There's also stomach muscles that move the food around.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

i think that c)gold was found there

but i am not sure