Some parasites, including tapeworms, are able to absorb all the nutrients they need to survive from their host and so have no digestive system. Ancestors of these tapeworms did have a digestive system, but over many generations, their genome has changed. This change in the genome is an example of

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This change in the genome over many generations is an example of evolution, as it reflects the genetic changes that have occurred in the tapeworms, allowing them to survive and thrive without a digestive system.

Some Parasites, Including Tapeworms, Are Able to Absorb All the Nutrients