Context: Mutualism or interspecies reciprocal altruism is a relationship between individuals of different species where both individuals benefit. In general, only lifelong interactions involving close physical and biochemical contact can properly be considered symbiotic. Mutualistic relationships may be either obligate for both species, obligate for one but facultative for the other, or facultative for both. Many biologists restrict the definition of symbiosis to close mutualist relationships.

Question: What is another term for mutualism?
Answer: interspecies reciprocal altruism

Question: Of what duration are symbiotic relationships?
Answer: lifelong

Question: What is a term for a relationship between individuals of the same species where both individuals benefit?
Answer: Unanswerable

Question: Who restricts the definition of symbiosis to indicate both obligate and facultative concurrently?
Answer: Unanswerable

Question: What time span involving gradual biochemical contact can properly be considered symbiotic?
Answer: Unanswerable

Question: What must interspecies reciprocal altruism be considered to fit the the definition of symbiosis?
Answer: Unanswerable

Question: What mutualistic relationships fit the the definition of symbiosis?
Answer: Unanswerable