A relationship between two organisms where one member harms the other.
Explanation:
An example is parasitism is a tick on a cow. The tick draws blood from the cow for nutrition. However the cow is harmed because the tick denies it of some nutrition and also the tick is a disease vector.
A relationship between two organisms where only one member benefits and the other is unharmed is called Commensalism.
A relation between organism where they all benefit is called symbiosis
Symbiosism can go up a notch where the collective contribution of all the organisms is higher than the sum of the individual benefits is called synergy.
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