Why did so many dinosaurs, fishes, and mammals grow so much larger than their modern counterparts?
2006-12-16 12:42:35 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
While all the above theories are sound, there is also the fact that over time, things tend to get more complex. Large things tend to be less complex. So, while the gravity, oxygen and food would all play a part, it was also further back on the evolutinary ladder. As time has progressed, things have gotten smaller and more complex. Again, this is yet another theory.
2006-12-16 12:53:41 · answer #1 · answered by AdamKadmon 7 · 1⤊ 0⤋
One theory as far as the dinosaurs go, was that the earth wasn't as large back then and therefore had less gravity, which allowed the land animals to grow larger.
2006-12-16 12:48:42 · answer #2 · answered by Anonymous · 1⤊ 2⤋
This is not necessarily true.
The smallest and largest mammals that have ever existed are alive today: pygmy shrew and great blue whale.
2006-12-16 13:54:11 · answer #3 · answered by Jerry P 6 · 0⤊ 0⤋
Their enviroment provided more food and there wasn't a human population also nature downsized them according to enviroment over millions of years because of food supply and other factors..
2006-12-16 12:48:58 · answer #4 · answered by Anonymous · 1⤊ 0⤋
because the size of people was much larger ....so they required a huge food to fill their tommies.
2006-12-19 22:51:26 · answer #5 · answered by greatmangentletrue 3 · 0⤊ 0⤋
Oxygen content was much higher than it is today.
2006-12-16 12:48:52 · answer #6 · answered by cowboy 2 · 3⤊ 0⤋