The muscular system is the only system that does not directly involved in the body's regulation of water. So lettered B is the answer.
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A crystal is rigid framework of many ions locked together in a repeating pattern.<span>A </span>crystal<span> or crystalline solid is a solid material whose constituents (such as atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a </span>crystal<span> lattice that extends in all directions.</span>
Answer:
The stratosphere contains 9.9% of air mass over the Earth. 90% of the ozone layer is found in the stratosphere's upper crust. For more information, look it up. Oh and by the way, airplanes fly in this layer. Hope this helps. Good luck on anything your doing. Please mark brainliest if you feel like it, I would really appreciate it.