Parasites have evolved special adaptations while living on and in the host species they are as follows:
(i) The loss of unnecessary sense organs for example: lice, mites and fleas don't have wings.
(ii) Presence of adhesive organs or suckers to cling on to the host for example - in tapeworms and leeches.
(iii) Loss of digestive system i.e., tapeworm.
(iv) High reproductive capacity i.e., roundworm produces large progeny.
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