Freshwater leeches attach to fish and suck blood from the fish for extended periods of time. This results in sores on the fish that often become infected.

Question

This relationship is best described as
.

Answer 1

This relationship is best described as parasitism. In a parasitic relationship, one organism (the parasite, in this case, the leech) benefits at the expense of another organism (the host, in this case, the fish), which suffers harm. The leech feeds on the blood of the fish, leading to sores and potential infections, demonstrating the negative impact on the host.