What are homologous organs? How do they differ from the analogous organs? How does the study of comparative anatomy provide evidence in favour of organic evolution?

Explanation

Organs having different functions but similar embryogenic origin internal structure, basic plan, development and having similar relation ship with adjacent organs are called homologous organs.
They indicate close relationship between their possessors e.g., the forelimbs of human, wing of bird, leg of horse and flipper of a seal are all apparently different from one another in structure and function, yet they are all built on the same pentadactyl plan, having the same number of bones, muscles, blood vessels and nerves arranged in the same pattern and developed similarly. Evidences indicate that the organisms having homologous structures must have arisen from common ancestors through successive generations. Thus, they help in providing evidence for organic evolution.