Few fossils are ever discover due to the rapid decomposition of most deceased and the specific conditions must be met for fossilization to occur true or false

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if you know your abc's you should be able to get your answer or just use google

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.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.