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The body size of animals depends on "external physical" factors and "internal physiological" factors. The length of the animals depends on the following factors: 1- Strength of the circulatory system 2- Air pressure 3- Density of Blood 4- Earth surface gravity 5- Amount of hemoglobin affinity for oxygen 6- Body angle relative to the ground Why a today animal cannot be tall like a dinosaur 100 million years ago. Which of the above factors has changed during this time?