Answer and explain

Dear student, physiological means related to function. An example of such adaptation is vermiform appendix. It is a vestigial organ in humans. Charles Darwin suggested that the appendix was used for digesting leaves as primates. It may be a vestigial organ of ancient humans that has degraded to nearly nothing over the course of evolution as humans switched from herbivores to omnivores. The very long cecum of some herbivorous animals like horse where it is still functional support Darwin. Since out of all the four options antifreezing protein does not fit in the definition, hence option 3 is correct. Thanks and regards