Evolution

Seal (Phoca) is a marine, gregarious and carnivorous fish (actually a mammal). The forelimbs are modified into paddle for swimming adaptation.

Biogeography is the study of the geographical distribution of life forms on earth. Darwin undertook a voyage on the ship HMS Beagle. The ship traveled the Southern Hemisphere where life is most abundant and varied. Along the way, Darwin found different forms of life vary different, from those in England. As he sailed southward along the South America, he found that similar species replaced each other. He thought that related species could have been modified according to the environment His views got confirmed on Galapagos islands (small group of volcanic islands off the Western coasts of South America). Darwin found different modified forms of finches which seemed to have descended from mainland finches as a result of the natural selection.

Answer (b) Similar anatomy