Which of the following types of organs are supposed to be functional in ancestral species rather than in present day species

Which of the following types of organs are supposed to be functional in ancestral species rather than in present day species

مندرجہ ذیل اقسام میں سے کون سے اعضاء آج کل کی نسلوں کی بجائے آبائی انواع میں کام کرنے والے ہیں
Explanation

The vestigial (organ) is a degenerate organ or structure or physical attribute that has little to no function in the species

but possesses an essential function in the preceding evolutionary form of the species.

ND18-9-2023