Both involve gaining a positive effect from a source which becomes harmed.
Example: a predator eats it's prey for food
A parasite like a tape worm feeds off the nutrients in your body and makes the person sick
Both predatory and parasitic relationships involve one species benefiting at the expense of another. In predators, the prey is killed for energy, while in parasites, the host is harmed as nutrients are taken. These relationships illustrate the interconnectedness of species within ecosystems.
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