Why do internal parasites focus so much on reproduction instead of other body systems?

Question:

Answer: internal parasites infest every body system, but often they have to rely on hosts repro sys to get their own gametes out there so they can out-cross genetaically. Or there is a secondary host they need to get into via urine (like bilharzia) or indeed they burden the host so mcuh in terms of numbers they will kill the host and therefore die themselves unless they get into anohter of the same host species! repro system is virtaully only guaranteed way of doing this.

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