Objective 1. Students will define symbiosis. 2. Students will name and explain the types of symbiosis. 3. Students will name and describe symbiotic relationships. VIII. Symbiosis a. Symbiosis is the long term close interaction between two organisms. Symbiosis can be helpful to an organism while causing harm to the other or can give benefit to an organism while having no effect on the other organism. b. The types of symbiosis are: 1. Predation: is how an organism actively hunts another as prey in order to get nutrients or food. The hunter is a predator; the hunted is prey or food. 2. Parasitism: is when an organism assaults another (but not with the intention to kill it), in order to get nutrients or food. The assaulting organism is the parasite while the assaulted is the host. Parasites usually harm an organism, and if too many are produced, may sometimes kill it. 3. Mutualism: is an interaction between two organisms in which both benefit. 4. Commensalism: is the relationship in which one organism is benefited while the other is unaffected. 5. Ammensalism: is the relationship that all of us may share at some time in our environment; this relationship is when no one is affected by another. Scientists are still debating as to whether ammensalism is possible. 6. Competition: is when two organisms want/need the same limited natural resource, such as food, water, space/territory, mates, pollinators, sunlight, etc. and therefore struggle with each other to get it.
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