Which level of organization is characterized by a group of cells that work together to perform a common function? O organ
tissue
organ system
O organism
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Organ Tissue

Explanation:

A group of cells that work together to perform a common function is called a organ tissue.

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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