You should open the valve slowly in order to gradually vent excess pressure is an example of an effectively worded imperative mood step in a set of instructions.

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photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.