Answer:
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.
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
What is up that’s also down? What’s a smile and a frown?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.