Runoff is the stage of hydrologic cycle
A single molecule is the one that is responsible for initiating a signal transduction pathway. The answer in this question is a single molecule. Molecule is defined as an electrically neutral group of two atoms or more held together by a chemical bonds.
Since a fox has a backbone and all to be a vertebrate you must have a backbone then a fox is a vertebrate.
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<span>the portion of an antigen that binds covalently to an antibody</span>
