The study of the homologous structures in mature organisms provides the evidence for the evolutionary relationships among certain groups of organisms. Which field of the study includes this evidence of evolution?
Comparative cytology
Biochemistry
Geology
Comparative anatomy
Connecting link between Annelida and Mollusca is
$A$ : India falls under oriental realm out of other biogeographical realms.
$R$ : World is divided in six biogeographical realms.