Read the following selection from the section "Another Threat To Sea Otters." It reveals how this view of the food chain, from the top to the bottom, provides us with an illuminating new way of looking at nature and its tightly interwoven components. Which two words would BEST replace “illuminating” and “components” in the selection above?

answer; the above statement is (true);

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

when it is at an intermediate population density

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.