1 Pterodactyl (reptile) 2. Bat (mammal) 3. Albatross (bird) Why are the wings considered analogous structures while bones in these forelimbs are considered homologous structures?

The forelimbs of all mammals have the same basic bone structure. Analogous structures are structures that are similar in unrelated organisms. The structures are similar because they evolved to do the same job, not because they were inherited from a common ancestor. Birds and bat wings are called analogous because they have separate evolutionary Origins but they both perform a similar function which is a key role in flight. Analogous organs are the result of convergent evolution.

The wings of Pterodactyl, bats and birds are considered as analogous structure. they are similar in structure and same in function and evolved independently in the two groups of animals.

Bones in  forelimbs of pterodactyl, bats and birds are  considered homologous  structures as they inherited the pattern from a common ancestor and have different functions.