Which structures produce a fluid to protect the body in the first line of defense? Select four options. A. hair
B. stomach
C. mouth
D. eyes
E. skin

b,c,d,e.

Explanation: got them all right on my edgenui ty unit test

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!