Pls solve this question from ecology

Dear Student,
Increase in the heart pulsation at high altitude is an example of behavioural adaptation. Physiological adaptation is the internal response to the external stimuli to maintain the homeostasis in the organism. But behavioural adaptation is the activities an organism do for its survival in its natural environment. As heart pulsation comes to normal again after some time it is an example of behavioural adaptation. So , the correct option is 4th.
Regards.
 

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