Bull vs. Bear Markets. The opposite of a bull market is a bear market, which is characterized by falling prices and typically shrouded in pessimism. The use of bull and bear to describe markets comes from the way the animals attack their opponents.
Symbiosis is a close relationship between two or more different species. There are three types of symbiosis we will discover: CommensalismâA relationship where one species obtains food or shelter from the other species. Does not harm or help the other species. MutualismâA relationship where both species benefit from the relationship. Parasitism-- A relationship between two species in which one species (the parasite) nourishes itself to the disadvantage of the other species (the host). Today you will be given a card with a picture and name of a particular species.
1 The relationship between two different species of organisms that are interdependent; each gains benefits from the other. 2  A relationship between different species where both of the organisms in question benefit from the presence of the other.ymbiosis. 1  Anton de Bary's original definition says: a long-term relationship between two different species. 2  To this can be added, mutualism, (benefit for both), commensalism (benefit for one neutral for the other) and parasitism (benefit for one, costly for the other).