A) In brood parasitism (of Koel and Crow), the eggs of parasitic bird have evolved to resemble the host's egg in size and colour to reduce the chance of the host bird detecting the foreign eggs and ejecting them from the host.
B) Majority of parasite harming the host.
C) Many parasites have evolved to be host specific in such a way that both host and the parasite tend to co-evolve.
D) Monarch butterfly require chemical by feeding on a poisonous weed in its adult stage, that chemical makes it highly distasteful to the birds.
Correct Answer: D
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