I feel that there must be some physiological stressors or environmental factors that inhibit modern organisms of all domains from reaching the size, of say, a megaladon or brontosaurus.
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Was a far more balanced ecosystem, mankind has truly wreaked havoc upon it. The oxygen enrichment in the atmosphere was at a much higher percentage. I could get theological about it if you want. But even from a darwinian pov as the limate changed from human burnin carbon/lignum fuel sources (wood,leaves,seeds and seed pods) the CO2 slowly accumulated to levels where such heavy animals ,with slow respiratory rates, could not as easily get sufficient oxygen to hunt and outrun human predation. Eventually ts caused them to bear smaller offspring which eventually caused changes to the genome of these species until we have the sall faster animals (most of which are mammalian and have higher respiratory rates).
Lemme know if you would prefer a theologically based answer.
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