Final answer:
Cryptobiosis, a form of biological stasis exhibited by tardigrades, occurs in response to various environmental challenges including desiccation, low temperatures, vacuum, high pressure, and radiation.
Step-by-step explanation:
Cryptobiosis, a form of biological stasis exhibited by tardigrades, occurs in response to various environmental challenges including desiccation, low temperatures, vacuum, high pressure, and radiation. During cryptobiosis, tardigrades can suspend their metabolic activity for extended periods and survive extreme conditions.