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1) Complement System, Lymphatic System, and Circulatory System

2)Tonsils can stop germs entering the body through the mouth or the nose. Spleens filter your blood, destroying old and damage red blood cells.

3)Your skin is a waterproof barrier that secretes oil with bacteria-killing properties.

Explanation:

what's the question ?

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.