2. What does the author mainly describe in the text?
A. how natural selection changed the population of peppered moths
B. how the Industrial Revolution improved the lives of workers
C. how Charles Darwin devised his theory of natural selection
D. how humans influence organisms via artificial selection
3. What conclusion can be drawn from the change in population of light gray peppered

it would be c. xylem.

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.