Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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Instead of walking he could run or jog. If there is a longer way he took take that way
The correct answer is D.
When designing a personal fitness program you should take into consideration what your goals are meaning what you want to realistically achieve, what activities you would like to do to get fitter and where and how you can do them and then create a variety of activities for yourself so you don't get bored and lose interest in your fitness plans.
Can be the skin or tongue
