Dangling high above the ground, this rock climber relies on muscular strength to pull her weight higher and higher. However, muscles alone will not ensure her safety. Explain why the muscular system cannot act alone to perform a skill such as rock climbing. Describe what other systems must be a part of this rock climber's game plan.
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Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.
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Dangling high above the ground, this rock climber relies on muscular strength to pull her weight hig...
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