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Two groups look externally similar but cannot breed successfully with each other. What can this indicate?

Answer and explanation

Correct answer: They may be different species

A biological species is commonly identified by the ability of its members to interbreed and produce viable, fertile offspring. External appearance alone may be misleading because unrelated groups can look alike, while closely related populations may differ internally. If two groups cannot breed successfully, reproductive isolation may indicate that they are different species. Hence A is the best answer; B and C ignore genetic or reproductive evidence, and D does not explain the failure to interbreed.

Related tags

SpeciesReproductive IsolationSpeciationHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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