Answer
6=C
7=All of the above
Explanation
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<span>The respiratory system of the body can be injured by volcanic ash that comes from a volcanic eruption. You can inhale this ash and it can get into your body and system and mess with your inner organs. I don't see how this can happen with boulders and rocks, as they are way too big to be inhaled the way ash can be.</span>
Aerobic exercise is physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process. Examples would be cycling, running, swimming, jogging, etc.