Largely proteins, some amount of carbohydrates and fatty substances.
proteins are found in meat.
Proteins could be found in milk, fish, or chicken.
Muscles
Amino acids are found in proteins.
urea
The liver is the main organ involved in the deamination of amino acids. Deamination is the process of removing the amino group from amino acids to produce ammonia, which is then converted into urea for excretion.
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
Surprisingly, membrane proteins are found in or attached to the membrane.
Amino acids are found in proteins.
Ribosomes are the structures found on the ER that manufacture proteins.
Nitrogen is found in proteins but not in carbohydrates and lipids