Hans selye's definition of stress is considered a response-based definition because it conceptualizes stress chiefly in terms of the best action to take in order to eliminate the stressor body's baseline reaction to ordinary events body's physiological reaction to any demand that is placed on it mental health of the individual

The answer is body's physiological reaction to any demand that is placed on it .

Hans selye describe a stress as responses of the body to any changes of demand. The response of the body to the demand could be harmful as it could lead to some disease like stomach ulcer. It is important to know what your stress source and manage it before the stress start to harm your body.

answer; /// i believe the correct answer is (reactants);

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.