21. The table below shows description of sizes of glomeruli renal tubules of two animals which are
living in different environments
Animal X
Animal Y
Glomeruli
Large and few
Small and many
Renal tubules
Short
Long
(a) Name the likely environment in which each animal lives
: (i) Animal x
(ii) Animal y​

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explanation:

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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.