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Thinking Scientifically
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  1. Carrots are tap roots. It is somewhat strange that these roots are orange since they are below ground and cannot engage in photosynthesis. What hypotheses could explain the evolution of this pigment?
  2. Design an experiment that tests the hypothesis that new plants arise at the nodes of a strawberry stolon according to environmental conditions pertaining to mechanical stimuli (whether nodes touch the ground, or not), temperature, water, and sunlight.

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