An example of a nonspecific defense provided by the skin is

a) antibodies.
b) fever.
c) proteins.
d) sweat.

The correct answer is- D) Sweat.

Non specific defense is a type of immune response ( also called innate immune response) that does not target any specific disease causing organism ( pathogen such as any specific bacteria or virus).

It is mainly provided by the surface of body ( such as skin that acts as an important barrier against external agents).

Sweat is an example of non specific chemical defense as it makes the surface of skin ( epithelium) acidic, thereby inhibiting the growth of pathogens ( such as bacteria) on it.

Thus, option D) is the right answer.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this