A reversible state of an organism when it shows no visible signs of life and when its metabolic activity becomes hardly measurable. It is induced by unfavorable environmental conditions such as high or low temperature, reduced oxygen (anoxybiosis) ,or drought (ahydrobiosis).

For example, tardigrades are able to suspend their metabolism and fall into cryptobiosis for almost 10 years. This adaptation allows them to survive extreme conditions of temperature, pressure, dehydration, and even radiation.

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