Which of the following aspects is a defining characteristic of living organisms?

  • A
    Isolated metabolic reactions occur in vitro.
  • B
    Increase in mass occurs only from the inside.
  • C
    Sense and response to environmental stimuli.
  • D
    Increase in mass due to accumulation of material on both external and internal surfaces.

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| :--- | :--- |
| $A$. Hooke's law | $1$. Tangential strain |
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| $D$. Elastic fatigue | $4$. $3$ times the linear strain |

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