If organisms A, B, and C belong to the same class but to different orders and if organisms C, D, and E belong to the same order but to different families, which of the following pairs of organisms would be expected to show the greatest degree of structural homology?A) A and D
B) B and D
C) B and C
D) D and E

D and E

Explanation:

The organisms are classified on the basis of their similarities and dissimilarities.

The taxonomic ranks are: Kingdom > Phylum> class > Order > family > genus > species.

As we move from kingdom towards the species the degree of similarities increases  i.e.  organisms that are grouped within a kingdom may have greater number of dissimilarities among them again more similar organisms are grouped into phylum, further organisms  whuich are more similar within a phylum are grouped into class and this goes on.

In a species the individuals are very similar and have least number of dissimilarities among them.

In the given situation, A,B and C are of same class But they are in different order but C,D and E are of same order.

So C is more similar to A and B when compared to D and E.

Thus, D and E  are expected to show greatest degree of structural homology.

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