Faiza A. Ghafoor on Nearpeer MDCAT Common Room

Assalamualaikum I have a confusion in homologous please any one who can clear it. Jese k hum ne parha hai homologous woh hote hai jin k Orion same hota hai and they have same structure but different functions jese k forelimbs of human and forelimbs of whale . Then how the origin is same because whale live in Ocean or Sea, on the other hand humans live on land. Try to explain it please .