the decrease of something required by an organism has a negative impact on that organism 's survival / that organism 's ability & if there is a loss of something then that something decreases ->  a loss of something required by an organism has a negative impact on that organism's survival  a loss of something required by an organism has a negative impact on that organism's survival & a plants / living things require water for survival / to grow ->  a loss of water has a negative impact on a plant's survival  a loss of water has a negative impact on a plant's survival & decreasing something negative has a positive impact on a thing ->  decreasing water loss has a positive impact on a plant's survival  decreasing water loss has a positive impact on a plant's survival & stomata closing reduces water loss -> stomata has a positive impact on plants by reducing water loss