If you had a Dio a light-year long, then after having sex, it would take at least a year before you felt anything—Wang Qi, in Hometown.
Although living beings were a probabilistic miracle, order accidentally emerging within a disorderly world, that did not mean living beings could do anything, nor did it mean evolution could solve every problem.
It was like how some people asked why ancient insects could grow several meters long, why dinosaurs were so much larger than modern mammals, and why mammals did not grow ever larger as they evolved.
On Earth, during the Mesozoic era when dinosaurs lived, atmospheric oxygen levels had reached twenty-six percent. Yet in the "Quaternary" at the end of the Cenozoic era, when humans lived, oxygen accounted for only a mere twenty-one percent. [At present, some scholars had proposed designating the period after the First Industrial Revolution as the "Anthropocene," to signify the immense impact human civilization had on geology—human civilization's activities could even affect geological eras. This was a geological-era concept on the same level as the Triassic, Jurassic, and Cretaceous. However, as of last year, this concept had yet to gain unanimous academic recognition.] That five-percent difference in oxygen content determined the difference in the upper size limits of terrestrial apex species between the Cenozoic and Mesozoic eras.
In the Paleozoic era, when giant insects had flourished, oxygen levels had been even higher.
And oxygen content was far from the only force restraining the growth of living beings.
Anyone who had learned basic geometry understood this concept—if a geometric body were continuously enlarged in equal proportions, the rate at which its surface area expanded and the rate at which its volume expanded would not remain on the same level.
Surface area expanded at X^2, while volume grew at X^3.
And