In which phase do the $Golgi$ complex and endoplasmic reticulum reform?

In which phase of mitosis do the spindle fibers shorten,causing the centromere to split?

The centromere splits during

Select the correct statement regarding $S-$phase of interphase.
$I.$ Occurs between $G_1$ and $G_2$ phase.
$II.$ $DNA$ replication begins in the nucleus.
$III.$ Centrioles duplicate in the cytoplasm.
$IV.$ As $DNA$ is doubled,the number of chromosomes also doubles.

Interzonal fibers are formed during which stage?

The cause of chromosomal movement during anaphase is ........