Mucous membranes and the skin are nonspecific defenses against infection. The functions of the skin in immunity are to block the entry of pathogens and to —

answers:
release white blood cells

produce antibodies

secrete sweat and oil

activate active immunity

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.

can i pls have the choices?