Explain how interactions between genes and the enviroment can affect phenotype

environmental factors can mutate genes and they will change

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.

yes, because even though a theory has a  lot of evidence to support it, it is not always true