Phase of mitosis in which the nuclear envelope breaks into small pieces is

The phase of mitosis in which the nuclear envelope breaks into small pieces is PROPHASE.

At prophase, the nuclear envelope is broken down; the chromosomes disperse into the cytoplasm, condenses and become visible; as well as the spindle fibers form.

A) 4 amusingb)alpha particle is a helium nucleus. it contains 2 protons and 2 neutrons.c)alpha particle has charge of +2.