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Can't find a biologist that calls a cluster of human proembryo cells that are dividing within the process of cleavage described as fission when a twinning event happens nor when scientists clone?  Really shocking to you isn't it. I could not either.

Here is my original thought. When a cluster of cells in which the cells get smaller and smaller generation after generation (cleavage) undergoes a twinning event and creates two clusters of cells in which the cells get smaller and smaller generation after generation (cleavage), I would not believe that to be fission in which a cell grows and then splits. Also even after the blastocyst divides it still does not grow in mass until it takes in nutrients from the mother to be.  That is not fission, it is the continued process of cleavage.

Just my original thought.  I could not even find a biologist that discusses your and many other philosophers fatherhoods describing human twinning as fission.