Problem: Given the question: What is the missing first step of the following process:  -  In this stage the chromosomes become visible and the centrioles separate and move to opposite poles of the cell - In prophase the chromosomes become visible and the centrioles separate and move to opposite poles of the cell - In metaphase the chromosomes line up across the center of the cell and become connected to the spindle fiber at their centromere - In anaphase the sister chromatids separate into individual chromosomes and are pulled apart - During telophase the chromosomes gather at opposite ends of the cell and lose their distinct rod-like shapes - Two new nuclear membranes then form around each of the two regions of DNA and the spindle fibers disappear.
++++++++++++++++++++++++++++++++
The answer is:
Prophase is the first and longest stage of mitosis


Problem: Given the question: What is the missing first step of the following process:  -  The water freezes into ice - The cracks expand - Over time the rocks split - The rocks are now in smaller pieces.
++++++++++++++++++++++++++++++++
The answer is:
Water gets into cracks in rocks


Problem: Given the question: What is the missing first step of the following process:  -  Embryo is C - Embryo grows and develops into a fetus inside the woman&#x27;s womb - The fetus is born - Begins to grow and develop through infancy and childhood - In the teenage years the human experiences puberty - Reaches sexual maturity - At 18 the human becomes an adult - Adult may procreate continuing the cycle.
++++++++++++++++++++++++++++++++
The answer is:

A man and woman mate