Two richest known sources of edible protein are – (1) Meat and eggs (2) Some algae and other micro-organisms (3) Soyabean and groundnut (4) Milk and leafy vegetables
(1) Meat and eggs Explanation: Meat, fish and eggs are the richest sources of protein. An ounce of meat or fish has approximately 7 grams of protein. A large ead contains 6 grams protein.