7A. Whales are marine mammals that share a common ancestor with a group of land mammals that includes hippos. Which observation provides evidence of the shared ancestry of whales and hippos? *

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.

a compound light microscope is used to magnify objects in steps.  

hope it