- ADivergent evolution.
- BArtificial selection.
- CGenetic drift.
- DConvergent evolution.
Organs having different origin but similar function are called analogous. Wings of butterfly and of birds look alike. They are not anatomically similar structures though they perform similar functions. Hence, analogous structures are a result of convergent evolution-different structures evolving for the same function and hence having similarity.
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Assertion $A$ : Breast-feeding during initial period of infant growth is recommended by doctors for bringing a healthy baby.
Reason $R$ : Colostrum contains several antibodies absolutely essential to develop resistance for the new born baby.
In the light of the above statements, choose the most appropriate answer from the options given below:
Reason : Zona pellucida remains undivided till cleavage is complete.