Answer:
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<span>D. difficult delivery
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It is letter B. Symbiosis
Symbiosis, a Greek word means living together. It is a specified class of a close and a long period of time natural interface between two different biological creatures – commensalistic, mutualistic, or parasitic.
Symbiosis can be necessary, which means that one or both symbionts completely depend on each other for existence and endurance, or either way they can generally live independently.
