Which of the following is a defining characteristic of living organisms?
A
Growth
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B
Ability to make sound
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C
Reproduction
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D
Response to external stimuli
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Solution
The correct option is D Response to external stimuli In physiology, a stimulus is a perceptible change in the interior or outside condition. The capacity of a living being or organ to react to those changes is called irritability or responsiveness to stimulus
So, the correct option is 'Response to external stimuli'.