The greatest difference in the concentration of respiratory gases is found in which of the following pairs of mammalian blood vessels?

The pulmonary vein and the jugular vein.

Explanation:

The greatest difference between the pulmonary vein and the jugular vein is that pulmonary vein takes oxygenated blood from both lungs towards the left atrium of heart while jugular vein takes the deoxygenated blood from head back towards right atrium of heart through superior vena cava.

So, the main difference is oxygenated and deoxygenated blood in the above mentioned veins.

carbon

explanation:

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms