The body's first line of defense against pathogens includes all of the following except: a) the skin, b) wax in the ears, c) white blood cells, d) mucous membranes in the nose and mouth

B wax in the ears is a second line defense 

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b