Modern firearms use the same principles as muzzleloading firearms. The ignition and burning of gunpowder create pressure. This pressure propels projectile(s) down the bore and out of the muzzle. The first modern firearms used black powder. Since about 1890, modern firearms are designed to use smokeless gunpowder. Smokeless gunpowder creates greater pressures and should not be used in firearms designed for black powder. Watch what happens when the trigger is squeezed on this bolt action rifle.
True because the arteries are like the extension cord of the heart so they have to add extra pressure.
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The sentence that is most precise regarding the benefits of physical activity is, option C. The jeopardy of injury and sudden heart attack during physical activity outweigh the benefits of being active for older adults. Physical fitness is even highly enheartened for older adults for many benefits that aims at reducing the peril of chronic diseases.
Discerning is the answer to your question.
