Which one of the following is most appropriately defined?
- AHost is an organism which provides food to another organism.
- BAmensalism is a relationship in which one species is benefitted whereas the other is unaffected.
- CPredator is an organism that catches and kills other organism for food.
- DParasite is an organism which always lives inside the body of other organism and may kill it.
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While explaining interspecific interaction of population,$(+)$ sign is assigned for beneficial interaction,$(-)$ sign is assigned for detrimental interaction and $(0)$ for neutral interaction. Which of the following interactions can be assigned $(+)$ for one species and $(-)$ for another species involved in the interaction?
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