True I would think honestly
The answer should be the "small intestine." 90% of digestion takes place in the small intestine and that's because that's during the process of digestion the small intestine sucks all of the nutrients out of the food then passes off the waste. Digestion starts as soon as you put food in your mouth because your saliva contains chemicals that breaks the food down.
Hope this helps!
It really depends due to the fact that many people learn differently some people are fast learners, some are slow paced and others are just in between. Independent study’s is good for going at your own pace without anyone pushing you.