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(C) Evolutionary trends can be classified based on the complexity of the organisms over time.$1$. Progressive evolution involves the development of mo

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Retrogressive

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(C) Evolutionary trends can be classified based on the complexity of the organisms over time.$1$. Progressive evolution involves the development of more complex and specialized structures from simpler ones.$2$. Retrogressive evolution (or degeneration) is an evolutionary trend characterized by the simplification of body structure,general degeneration,and the loss of complex organs,often seen in parasitic organisms.$3$. Stasigenesis refers to a state where there is little or no evolutionary change over a long period.Therefore,the correct term for the degeneration and loss of organs is retrogressive evolution.

Column-$I$	Column-$II$
$(1)$ Mutation	$(a)$ Change in population allele frequencies due to chance alone.
$(2)$ Gene flow	$(b)$ Difference in survival and reproduction.
$(3)$ Natural selection	$(c)$ Immigration,emigration change allele frequencies.
$(4)$ Genetic drift	$(d)$ Source of new alleles.

An evolutionary trend in which there is general degeneration and loss of organs is known as:

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