Which feature is an example of physiological adaptation? beak sizes of birds octopuses’ ability to squirt ink communicating in sign language school of fish in the sea length of animals’ ears

Octopuses ability to squirt ink.

Physiological adaptations are those adaptations which occurs at the metabolic level in the organisms. These adaptations occurs in the cells, tissues and organs of the body of the organism in response to external environmental stimulus. Physiological adaptations are beneficial for the survival of the organisms against predators. These adaptations generates a defense mechanism in the body of the organism, in order to increase it's chances of survival.  

Octopuses ability to squirt ink is an example of physiological adaptations as the ink is released in the water by these organisms in order to escape themselves from predators.  

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frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.