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- Which water loss that can be prevented by a Contour walls b Planting wind breaksSuppose a scientist measures sunflower height six months after groups of sunflowers were planted with and without phosphorus in order to test the effect of phosphorus on sunflower growth. All flowers were grown in a nitrogen-abundant environment. Which of the following would be considered a standardized variable? A. The duration of plant growth, B. The presence or absence of nitrogen, C. The presence or absence of phosphorus, D. None of the choices are correctExplain the adaptation favouring plant growth and development in cold regions.