. Which organ system is the xylem and phloem of the plant part of? A)Digestive system

B)Endocrine system

C)Respiratory system

D)Vascular system

C is correct ans

Explanation:

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

answerscaffolding proteins;