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Guard cells open stomata when they engorge with water and bow outward.
Q3: The missing label indicated by a "2"
Q17: Of the two basic structures of an
Q25: Even small concentrations of bicoid protein will
Q33: Which of the following best describes sensory
Q37: A paper cut that draws blood must
Q50: A spore growing into a plant that
Q55: An antigen is any foreign substance that
Q56: Some bacteria can obtain their nutrition by
Q60: If hybrid organisms result from the mating
Q75: B cell receptors are specific to only