Which of the following is NOT true of all respiratory systems? Use either lungs, gills, alveoli, or capillaries to deliver oxygen to cells via diffusion Exchange gas with tissues using a high SA:V Can be diffusion based or use structures that can exchange gas All of the above are true Extremely large ectotherms like the dinosaurs existed when similar mammals did not because... prehistoric habitats did not provide enough food for such animals to exist the sun could not warm up large mammals fast enough for them to survive in cold environments a constantly high body temperature would become too hot ectotherms were first to maintain a constant body temperature before mammals could evolve.

1. Which of the following is NOT true of all respiratory systems? Use either lungs, gills, alveoli, or
capillaries to deliver oxygen to cells via diffusion Exchange gas with tissues using a high SA:V
Can be diffusion based or use structures that can exchange gas All of the above are true
Extremely large ectotherms like the dinosaurs existed when similar mammals did not because...
prehistoric habitats did not provide enough food for such animals to exist the sun could not warm
up large mammals fast enough for them to survive in cold environments a constantly high body
temperature would become too hot ectotherms were first to maintain a constant body temperature
before mammals could evolve