The students realize that another lab group (Group B ) made their instrument with an effective string length of 2ℓ . The students observe that when both strings oscillate at their fundamental frequency, the frequencies are the same.

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The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.