question_answer 71)

  Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.

Answer:

                  Evolution's progressive trend seems to be more and more complex in body designs (or morphological structures), emerged overtime, e.g., immense diversity and increasing complexity is seen in body size, form and structure from non-chordates to chordates. But at the molecular level, these diverse type of organisms exhibit unbelievable similarity, e.g., the chemical composition of DNA is basically same in all living organisms except for differences in the sequence of nitrogenous bases. Other biomolecules like RNA, proteins, etc., also show remarkable similarity in all organisms. Thus, it shows that evolution has exhibited a greater stability of molecular structure ascompared to morphological structures.