Answer:
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
I have four wings but cannot fly. I never laugh and never cry. On the same spot always found, toiling away with little sound.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.