Organisms living in such extreme environments show a fascinating array of biochemical adaptation.
Option " C " is correct answer.

Physiological Adaptation:
Organisms living in extreme environments often undergo physiological adaptations to survive and function optimally. These adaptations involve changes in the organism's internal body systems and processes.

- Osmoregulation: In environments with high salinity or extreme temperatures, organisms must adapt to maintain a proper balance of water and salts in their bodies. They may have specialized mechanisms to conserve water or excrete excess salts.

- Thermoregulation: Extreme temperature environments require organisms to regulate their body temperatures effectively. They may have adaptations such as insulation (thick fur or blubber) to conserve heat in cold environments or mechanisms to dissipate heat (sweating or panting) in hot environments.

- Metabolic Adaptations: Organisms living in extreme environments often have unique metabolic pathways that allow them to obtain energy from unconventional sources. For example, certain bacteria in deep-sea hydrothermal vents use chemosynthesis to convert inorganic compounds into energy.

Behavioural Adaptation:
Behavioural adaptations are changes in an organism's behavior that help them survive and thrive in extreme environments.

- Migrations: Some organisms undertake long-distance migrations to escape harsh conditions. For instance, birds migrate to warmer regions during winter.

- Hibernation: Animals living in extreme cold climates may enter a state of hibernation during the winter months to conserve energy and survive the scarcity of food.

- Social Structures: Organisms may form social groups or colonies to enhance their chances of survival. This can be observed in certain desert animals that live in burrows together to escape extreme temperatures.

Biochemical Adaptation:
Biochemical adaptations involve changes in an organism's biochemical processes and molecular structures to survive extreme conditions.

- Antifreeze Proteins: Some organisms in freezing environments produce antifreeze proteins that prevent ice formation within their cells, allowing them to survive at sub-zero temperatures.

- Heat Shock Proteins: In high-temperature environments, organisms produce heat shock proteins that help protect their cellular structures from heat-induced damage.

Morphological Adaptation:
Morphological adaptations refer to physical changes in an organism's body structure that enable them to survive in extreme environments.

- Camouflage: Many organisms have evolved colors, patterns, or body shapes that help them blend into their surroundings, providing protection from predators or extreme environmental conditions.

- Specialized Appendages: Organisms living in extreme environments may have specialized appendages that help them navigate their habitats. For example, desert animals have long legs to minimize contact with hot sand.

- Respiratory Adaptations: Some organisms living in low-oxygen environments have developed specialized respiratory structures, such as gills in aquatic organisms or lungs with increased surface area in high-altitude dwellers.

In conclusion, organisms living in extreme environments exhibit a range of physiological, behavioral, biochemical, and morphological adaptations. These adaptations enable them to survive and thrive in conditions that would be otherwise inhospitable.