GACE Middle Grades Science 2025 – 400 Free Practice Questions to Pass the Exam

In parasitism, the interaction between the two species is characterized by a relationship where one species, the parasite, benefits by deriving nutrients or other advantages from the host, while the other species, the host, suffers harm as a result of this relationship.

This dynamic is typical of many ecological interactions where the parasite relies on the host for survival, often leading to negative consequences for the host, such as disease or depletion of resources. For example, fleas or ticks feed on the blood of mammals, benefiting from the nutrients they extract while causing discomfort, potential illness, or even death to the host. This illustrates the imbalance in the relationship where one party thrives at the expense of the other.

In contrast, scenarios where both species benefit or neither species is affected do not accurately describe parasitism. It's essential to recognize this specific interaction to understand its impact on ecosystems and species survival.