One difference between cancer cells and normal cells is that cancer cells . are unable to synthesize DNA are arrested at the S phase of the cell cycle continue to divide even when they are tightly packed together cannot function properly because they are affected by density-dependent inhibition are always in the M phase of the cell cycle

c

explanation:

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.

the answer is definitely a