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Relationships in nature Study guide Matching: _____1. A close, long-term relationship between two or more species A. Commensalism _____ 2. The struggle among living things to obtain the resources needed to live is called — B. Symbiosis _____ 3. The organism that a parasite lives on and harms is called a — C. Niche _____ 4. A tick that feeds on the blood of of animals is a ---- D. Parasitism _____ 5. A close, long-term relationship between two or more species E. Parasite _____ 6. A symbiotic relationship where both organisms benefit (are helped) F. Symbiosis _____ 7. A symbiotic relationship where one organism benefits and the other is unaffected G. Host _____ 8. A symbiotic relationship where one organism is hurt and the other is helped H. Mutualism Classify these examples of symbiosis as either commensalism, mutualism, and parasitism 1) Inside a human's intestine live bacteria that make vitamin K 2) Cowbird lays her eggs in the nest of another species of bird, removing one or two of the other birds eggs 3)A human picks up bacteria on his or her hands. The bacteria do not cause disease but do feed on the human's dead skin cells 4) A tick attaches itself to a human and feeds on the human's blood. 5) Honeybees get nectar from flowers and in return carry pollen to other flowers. 6) Moray eels are cleaned of parasites by cleaner shrimp. 7) Heart worm in dogs 8) M. leprae causes leprosy (Hansen's disease). It is an intracellular parasite, taking up residence in Schwann cells where, in due course, it triggers an autoimmune attack on them that leads to their destruction. The resulting loss of sensation makes it difficult to avoid injury to the extremities. 9) Crabs and Shrimps often form relationships with anemones in tropical waters, again for the purposes of protection from predation. For instance the Anemone crab, Neopetrolisthes oshimai, which is a filter feeding Porcelain crab, lives and captures its food from within the tentacles of giant anemones. 10) The drawing shows the Nile crocodile opening its mouth to permit the Egyptian plover to feed on any leeches attached to its gums. 11) Certain ants take a sweet liquid called honeydew from tiny insects called aphids. In exchange for the honeydew, the ants protect the aphids from predators. What kind of relationship is this? Explain your answer.