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Since humans supposedly evolved from apes, which in turn evolved from some 4-legged predecesor, there are no "new broad organizational plan" in the series.

But this is vacuously true at any point in history. It's much like if you said "No new giant redwood trees have come into existence in the last hundred years." If I pointed to particular examples of giant redwood trees today, you'd say, "Yes, but that tree was already there 100 years ago. It was just smaller." And if I pointed out small redwood saplings that didn't exist 100 years ago, you could say "Yes, but I specifically said GIANT redwood trees, and this is just a little one."

Similarly, if you could take your wayback machine back to the time when the first mammals came into existence, they wouldn't look like major new body plans. They would look very much like early reptiles, having only diverged recently.

It's only after a significant period of time has elapsed that you can use the benefit of hindsight to point to that divergence and say "See? That was the beginning of a major new body plan."
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