Mitotic spindles are microtubule-based structures that separate chromosomes during mitosis. So the cell would lack structure.
The answer to #2 Is a..biota is the life of "a" plant, or animal (etc.) of the particular region/habitat, etc.
Corynebacterium is the answer I believe
the mitochondrion is where it takes place
D: Where two continental plates are colliding, creating a convergent boundary. One plate slips under the other because of convection currents in the mantle.