Digestion takes place mainly in the small intestine by pancreatic enzymes eg trypsin or pancreatic lipase. but also a small amount takes place in the stomach by stomach enzymes eg pepsin or gastric lipase. of the lipase's pancreatic lipase is far more important in digestion of fats that gastric lipase. note that small amounts of starch digestion also takes place in the mouth due to the actions of amylase which is found in saliva. This action is short lived as the amylase action is abolished by the low pH of the stomach. No digestion takes place in the large intestine (aka the colon) as this is mainly for absorption of water and electrolytes.
In your stomach.
stomach
mouth
Mechanical breakdown helps chemical breakdown because when you chew, chemical breakdown is going on all at the same time. So, that is going to chemical because if you didn't have saliva (chemical breakdown) if would take real long to digest your food.
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Primarily in the mitochondria, but also in the endoplasmic reticulum.
cytoplasm
The oragan in which the most absorbtion of nutrients occurs is the small intestine.
The small intestine is where most of the food taken in by vertebrates is digested. It is also absorbed there.
A physical change that occurs during digestion is the mechanical breakdown of food into smaller pieces through chewing and churning in the stomach. A chemical change that takes place is the breakdown of macromolecules like proteins, carbohydrates, and fats into simpler molecules like amino acids, glucose, and fatty acids through the action of enzymes.
Weathering takes place the most in regions with high humidity and precipitation, such as tropical rainforests or coastal areas. This is because moisture accelerates chemical weathering processes by promoting the breakdown of rocks and minerals.
Almost all of the food you take in is absorbed in the small intestine. Most of the water you drink is absorbed in the large intestine.