Commensalism is defined as an association between two organisms in which one benefits and the other derives neither benefit nor harm. Sine the Barnacle is being benefited but the Whale is not behind helped nor harmed it is an example of Commensalism.
The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood.
