All chordates (animals with spinal cords) are dueterostomes.
The defining characteristic of all dueterostomes is the fact that the hollow ball of cells called a blastopore develops a dent that turns into the anus as the first stage of differentiation. So, in other words, the first thing that happens in our early embryonic development is that we turn into little ass holes.
Ironically, our whole existence consists of growing and evolving beyond that auspicious start; both literally and metaphorically.
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