A transitional form that supports the evolution of whales from land mammals is/a

Question

A transitional form that supports the evolution of whales from land mammals is/are _______. fossils showing species intermediate between whales and Land mammals. the fact that whales breath air the fact that whales nurse their young the fact that whales and hippos share DNA sequence homology Structural and developmental homology are all related to each other. In what why are they different? Structural homology typically involves adult structures whereas developmental homology involves structures seen in developing embryos. Structural homology typically involves adult structures whereas development homology involves DNA sequences. Structural homology typically involves protein sequences whereas developmental homology involves structures seen in developing embryos.

Explanation / Answer

Please find the answers below and reasons in parentheses:

Part 1: Choice 4 (Whereas whale are aquatic animals, hippopotamus are amphibians in nature. Evolutionary history between the two cannot be clearly defined but the genetic sequence similarities between these two organisms indeed helps in deciphering the transition of amphibians from aquatic animals. This holds true for other aquatic and amphibian animals as well and modern genetics and phylogeny have indeed proved the same.)

Part 2: Choice 1 (Structural homology is a branch of science in which morphological similarities and dis-similarities between organisms are studied based upon their physical characters. On the other hand, developmental biology is the branch of science in which embryological developmental manner of an organism is studied at both molecular and physical level. This is the major point of difference between these two branches.)

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