No , Protozoa lack back bone .
Yes , they have cytoskeleton .
Yes , Zooflagellates are Protozoa .
Yes, they are very primitive forms of life.
No there is more with backbones
No backbones
Pigs do have backbones.
it has 2 backbones
All snakes have backbones.
all fishes have backbones
The backbones are part of the skeleton.
no they don't have backbones
no myriapods don't have backbones