Members of Chondrichthyes differ from members of Osteichthyes by having (a) . jaw bony skeleton cartilaginous skeleton two sets of paired fins

the answer is: metamorphic rocks often show the presence of fossils, also a

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the question isn't complete here so i can't right an answer '_'

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.