LIFE SCIENCE

Detailed explanation-1: -Vestigial structures are remnants of organs or structures that had a function in an early ancestor.

Detailed explanation-2: -Vestigial structures are historical remnants of structures that had important functions in ancestors.

Detailed explanation-3: -more explicit definition: vestigial structures are largely or entirely functionless as far as their original roles are concerned – though they may retain lesser functions or develop minor new ones.

Detailed explanation-4: -“Vestigial organs are the organs that have no apparent function and are considered to be the residual parts from the past ancestors.”

Detailed explanation-5: -Organs that have different functions but similar structures are known as homologous organs. They share a common ancestor. They are formed due to divergent evolution and because of their structural and evolutionary similarities, all vertebrates have common ancestors.