Value
Although parasites are generally considered to be harmful, the eradication of all parasites would not necessarily be beneficial. 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. 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.
Read more about this topic: Parasitism
Famous quotes containing the word value:
“And those handmade presents that children often bring home from school: They have so much value! The value is that the child put whatever he or she could into making them. The way we parents respond to the giving of such gifts is very important. To the child the gift is really self, and they want so much for their selves to be acceptable, to be loved.”
—Fred Rogers (20th century)