[Question_Assumptions]

A close examination of this period of time shows that there are millions of chemical reactions involved, sequentially and simultaneously, that individually offer no particular distinguishable moment.

You are playing the postmodernist game of looking at the forest one tree at a time and then declaring that there is no forest, only trees. Step back and look at the forest.

[beavus]

You are playing the postmodernist game of looking at the forest one tree at a time and then declaring that there is no forest, only trees. Step back and look at the forest.

I haven't declared that there is no forest. And, in a forest, there truly are trees. Things are frequently seen to change along continua. I can give you many other examples if you like. That doesn't mean gametes are not different from babies. It just means that there is no nonarbitrary instant which one can point to within the continuum (by definition of "continuum").