Question -With regard to the assertion and reason, choose the correct option. Assertion [A]: Extinctions have a domino effect. Reason [R]: The extinction of one species affects the survival of other species that are in obligate relationship with the extinct one.
Options:
A .  Both A and R are correct and R explains A
B .  Both A and R are correct but R does not explain A
C .  A is correct but R is incorrect
D .  Both A and R are incorrect
Answer: Option A : A Most species co-evolve in their natural habitat; therefore most organisms have deep-rooted and sometimes obligate relationships with other species in their habitat, for e.g., an obligate predator, parasite or a pollinator.When one such organism is lost, their relationships are also lost, thereby threatening the survival of other species that are associated with it, either through mutualistic, predatory or parasitic relationships.
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