Ammonia
Largely proteins, some amount of carbohydrates and fatty substances.
proteins are found in meat.
Proteins could be found in milk, fish, or chicken.
Muscles
in proteins.
urea
Through researching this question i have found out that the stomach absorbs proteins which are made up of amino acids. After the stomach amino acids are then absorbed by the duodenum ( a buffer for acids in the stomach in small intestine, called sodium bicarbonate).
There is no substance absolutely restricted to Earth (unless you count DNA, proteins, etc., but these are almost guaranteed to exist somewhere else).
The substance found in foods that is energy-rich is called macronutrients, specifically fats, carbohydrates, and proteins. These macronutrients provide the body with the energy it needs to function properly.
Largely proteins, some amount of carbohydrates and fatty substances.
proteins are found in meat.
Proteins could be found in milk, fish, or chicken.
Muscles
in proteins.
Surprisingly, membrane proteins are found in or attached to the membrane.
Ribosomes are the structures found on the ER that manufacture proteins.
Proteins have nitrogen in them but not in carbs.