An organism that lives in or on another organism, often with harmful side effects-but without benefits is a?

Parasite

Explanation:

Parasitism is an interspecific ecological relationship (occurs between different species) where one species, called a parasite, feeds at the expense of another species, called a host, causing damage to it.

answersilicon (si); oxygen (o);

the pseudoscience are like beliefs, theories, or like practices that are considered scientific