The respiratory system is separate from the circulatory system. It is a complex network of tubes that delivers oxygen-containing air to every cell of the body.
Answer: tracheal tubes
<span>When an elephant flaps its ears to cool off, it is using a behavioral response to adapt to their environment/temperature</span>
The answer is D.)All of the above.
Its D because, energy can not be created or destroyed, all energy has to go somewhere. And an organisms energy must come from somewhere because you cant make it, its just there.
