[Fiona]

انگل تازه زیان نمیزند و تنها بهره میبرد

انگل تعریف مشخصی دارد. به موجودی که از میزبان به صورت یک طرفه سود میبرد انگل میگویند.

دوستان گرامی؛ بی گمان همیشه هم انگل ها بی سود نیستند:

Parasites account for as much as or more than half of life's diversity; they perform an important ecological role (by weakening prey) that ecosystems would take some time to adapt to; and without parasites organisms may eventually tend to asexual reproduction, diminishing the diversity of sexually dimorphic traits.[SUP][21][/SUP] Parasites provide an opportunity for the transfer of genetic material between species. On rare, but significant, occasions this may facilitate evolutionary changes that would not otherwise occur, or that would otherwise take even longer.[SUP][1][/SUP]