There are many ways in which organisms in which and ecosystem interact. two of these relationships are parasitism and predation, in what way is parasitism similar predation?

Parasitism is the relationship between two species where one organism (the parasite) benefits from another organism (by living in it and) causing harm to the host parasite.

While predation is an interaction between two organisms (predator and prey) where the predator eats a prey or a part of its body.

Considering these two relationships, we can say that both of them grow at the expense of the host or prey. Therefore, both of the predator and parasite are dependent on prey or host for their survival.

Parasitism and predation are similar in way that in both process only one partner gets benefited while other gets harm.

Explanation:

Parasitism is a relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm.

The preying of one animal on others.

In both case second party always get harm.