[DungeonMaster]

We use the 747 because of the complexity of the simplest known form of life. One has to imagine a simpler one which also no longer exists. None of the imagined pre bacterium steps exist. By the way what is the next step after a single celled animal? Is there a 2 celled or a 4 celled animal out there somewhere? I can't find one on the internet. The next thing I find is a rotifer with 1000 cells.

Given the football stadium analogy do you have a guess as to how big an average amoeba would be compared to that stadium sized bacterium?

[BroJoeK]

DungeonMaster: "We use the 747 because of the complexity of the simplest known form of life."

Again, sticking with your flawed analogy, it didn't start off as a 747, it started off much simpler & smaller, long before Kitty Hawk in 1903.
And again, it took 100 years for conscious thought to advance flight from Kitty Hawk to, say, the 747-8 but it took evolution 100 million years to advance from, say, Archaeopteryx-like to modern birds.

Baby steps, always baby steps.