Mutualism can take on many forms: Symbiosis: in which both organisms live together in closely proximity, and in which both generally derive benefit. The relationship is obligate, meaning at least one of the species must be involved in the relationship to survive.
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even as it has watched prices dip opec declined to cut back on production at its november meeting some observers had expected a production cut to boost the price of crude oil prices have tumbled 40 % this year and are now trading below $ 60 per barrel a five year lowgas prices have come down too the u s nationwide average was $ 2 60 on sunday in some parts of the country gas is below $ 2pec won t rush to cut oil production even if prices fall as low as $ 40 per barrel one of the cartel s members said sunday