Corrigendum. The Week in Review. 03/26/2017
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(+/-) Where one organism benefits (the parasite) and the other is
negatively affected (the host). Fleas on a dog are a great demonstration of Parasitism at work.
(+/--)Where one organism benefits and the other neither benefits nor is
negatively affected. An example is barnacles on a whale - the barnacle gets
a place to live and relative safety, and the whale seems unaffected.
(+/+)Where one or more organisms benefit from the partnership occuring
between them. Clown fish in anemonies and photosynthetic zooxanthallae
algae in corals are both examples of an "intimate" relationship occuring
between two species.