If you own a dog, each year, depending on the region where you live, you will need to buy medication that treats roundworms and ticks and fleas. These organisms live either internally or externally on dogs and obtain all their nutrients from the dog. In some cases, dogs are harmed due to these interactions. This describes a __________ relationship.

Question

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The described relationship is parasitic because the organisms (roundworms, ticks, and fleas) live on or in the dog, obtaining their nutrients at the dog's expense, often harming the dog in the process.

If You Own a Dog, Each Year, Depending on the Region