CACTUSJACKmankin
Scientist
Interesting note about butts or rather the hole. most groups of animal have two holes, food goes in one and out the other. there are two kinds of animals, mouth first (protostomes) and mouth second (deuterostomes). embryologically the first hole that develops in insects for example, will eventually become the mouth so they are protostomes. in humans (being deuterostomes), however the second hole that forms is destined to be the mouth so guess which hole develops first. based upon my observations of most humans, this makes A LOT of sense.The irreducible complexity of our butts really astonishes me.
How did our rear-ends come to exist?
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