Bacteria is the simplest of cells. one special feature of bacterial cells that it survive in hostile environments is its
a) dna.
b) capsule.
c) flagellum.
d) pilli.

I think the answer is capsule. It is a protective outside layer of a bacteria that also carries diseases. The capsule has components which prevent itself from being engulfed by a phagocyte, cell that protects a body.It also contains water that prevents the bacteria from drying itself. The capsule is made of a polysaccharide.  

Except hold on to his or her beliefs even if there is no evidence for those beliefs.