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?

Analogous structures are structures which serve similar function in different organisms and evolved independently in two living organisms while homologous structures are the structures which are similar in related orgnanism due to inheritance.

The wings of Pterodactyl, bats and birds are conisdered 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.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.