In predation and parasitism one species is benefitted while other is harmed. Parasite obtain food from host by harming them.##@

Introduction:
In ecological interactions, there are various ways in which species interact with each other. Some interactions are mutually beneficial, while others can be harmful to one or both species involved. The question asks us to identify the interaction in which one species is benefited while the other is harmed. The correct answer is option 'C', which includes predation and parasitism. Let's understand these interactions in detail.

Predation:
Predation is an interaction in which one species, called the predator, captures, kills, and feeds on another species, called the prey. In this interaction, the predator benefits by obtaining food and energy for its survival and reproduction. On the other hand, the prey is harmed as it is killed and consumed.

Parasitism:
Parasitism is an interaction in which one species, called the parasite, lives in or on another species, called the host, and obtains nutrients and resources at the expense of the host. The parasite benefits from this interaction as it gets access to a suitable habitat and a source of nutrition. However, the host is harmed as the parasite consumes its resources, often leading to weakened health or even death.

Explanation of the interaction:
In the given option 'C' (predation and parasitism), both interactions involve one species benefiting while the other is harmed.

- In predation, the predator benefits by obtaining food, while the prey is harmed as it is killed and consumed.
- In parasitism, the parasite benefits by getting access to resources and a suitable habitat, while the host is harmed as its resources are consumed, leading to potential negative effects on its health and survival.

Therefore, the correct answer is option 'C' (predation and parasitism) as it includes interactions where one species benefits while the other is harmed.