Explain evolution based on comparative anatomy and morphology.

(A) Comparative anatomy and morphology show similarities and differences between organisms of today and those that existed years ago. These similarities suggest that modern organisms may have descended from common ancestors.
For example,the forelimbs of whales,bats,cheetahs,and humans (all mammals) share similarities in the pattern of bones. Although these forelimbs perform different functions,they share a similar anatomical structure. In all of them,the forelimbs consist of humerus,radius,ulna,carpals,metacarpals,and phalanges.
Thus,these animals developed organs with similar structures,but they adapted in different directions to meet different needs. This is called $divergent$ $evolution$,and these structures are $homologous$. Homology indicates common ancestry. Other examples include the hearts and brains of vertebrates.
In plants,the thorns of $Bougainvillea$ and the tendrils of $Cucurbita$ are homologous organs.
$Convergent$ $evolution$ occurs when different structures develop for similar functions,resulting in similarities. Other examples of analogy include the eyes of octopuses and mammals,or the flippers of penguins and dolphins. One could argue that similar habitats forced different groups of organisms to adopt similar adaptations for similar functions. Sweet potato (root modification) and potato (stem modification) are another example of analogous organs.
In this context,it can also be argued that the functional mechanisms of proteins and genes are similar across various organisms. This also points to a common ancestor. Biochemical similarities also suggest a common ancestry,just as structural similarities do among various organisms.