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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Today's low prices in oil stocks provide investors with an opportunity to buy at a bargain. Many leading oil companies have underpriced stocks, but that may soon change. Chevron is trading at a large discount to its summer high of $133 per share; it's currently at levels around $90 per share.il stocks have taken a huge hit in 2015. This market-wide decline in oil stocks is due to weak consumer demand, record production from the United States, a rising dollar and weaker corporate profits.