شرکت در آزمون آنلاین زبان انگلیسی 1 - درس2 | آزمون شماره 6602

Observing our own bodies to discover the relationship between organs allows us to better understand the connections in human ………. . This knowledge lets us know how great God is.

In a general description, I would have to say that white blood cells help ............... the body against infection.