[ckca]

Most people, I think, would not consider a small cluster of cells, at most 72 hours old, to be human.

If not human, what is it?

You and I both began life as first a fertilized egg then a small cluster of cells then eventually what we are today.

I assure you, since conception, I have been fully human.

On the other hand, you could argue that you were never and are not now human.

Some would believe your rhetoric, but I would fight to save your right to your human life, then as now, despite your ignorance of the scientific objective fact of when human life begins.

[MHGinTN]

The poster in question has a problem differentiating organ and organism ... the 'cluster' is an organism, the cells in his mouth are sub-units of an organ within his organism.

[Modernman]

If not human, what is it?

A potential human, given enough time and the proper circumstances.

On the other hand, you could argue that you were never and are not now human.

No one could logically argue that an adult human is not a human being. Reasonable people can disagree as to whether a cluster of cells qualifies as human.

despite your ignorance of the scientific objective fact of when human life begins.

Biology determines when life begins, but what constitutes a human being is a question for ethicists and philosophers.