Zoology 10th Edition by Stephen Miller,John Harley

Exercise 16

Interspecific interactions affect all characteristics of a population. Herbivory, predation, and interspecific competition for food and space can limit population size and where populations live. Animal populations are often characterized by shared evolutionary histories with other animals or plants. Coevolutionary relationships include symbiotic relationships and color patterns in animals.
Parasitism results in harm being done to the host. Under what circumstances would the weakening or death of a host benefit a parasite?