Organs combine to form …
a cells
b tissues
c organ systems
d organisms

C - organ systems.

Explanation:

For future reference - Cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, and organ systems combine to form an organism.

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry