Microscopic organisms live at such extremes that, taking them into consideration, the thickness<span> of the </span>biosphere<span> is much greater. Culturable microbes have been found in the Earth's upper atmosphere as high as 41 km (25 mi).</span>
<span>If an object is accelerating then the forces applied on them are unbalanced, balance forces will cause the object to remain stationary or move at a constant velocity.</span>
