Question

8
multiple choice 6.25 points
below is an image showing homologous structures in several mammals.
human dog bird whale
this photo by unknown author is licensed under cc by
which of the following conclusions can be drawn regarding this information?
these mammals likely share front limb function based on homologous structures.
these mammals likely share a common ancestor based on homologous structures.
these mammals likely share an omnivorous diet based on homologous structures.
these mammals likely share a habitat based on homologous structures.

Explanation:

Homologous structures are anatomical features in different organisms that have a similar underlying structure (derived from a common ancestor) but may have different functions. For example, the forelimbs of humans (used for grasping), dogs (used for walking/ running), birds (modified for flight - though birds are not mammals in a strict sense here, but the homologous structure concept is key) and whales (modified for swimming) have a similar bone pattern (humerus, radius - ulna or equivalent, carpals, metacarpals, phalanges). This similarity in structure (not function, diet, or habitat) indicates a common evolutionary origin.

Answer:

These mammals likely share a common ancestor based on homologous structures.