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Describe the basic graph of a predator-prey. In three to five sentences construct an argument that shows why lichens are necessary to establish a new ecosystem after an extreme disturbance. Predation Herbivory And Parasitism Learn Science At Scitable Paine and his students from the University of Washington spent 25 years removing the sea stars from a tidal area on. . A non-living or physical factor that may influence an organism or ecosystem. Describe the term keystone species. B The lack of predators could mean that too much primary production occurred. This balance of nature hypothesis has been criticized by some scientists because it suggests a relationship between predators and prey that is good and necessary. They grow more slowly reproduce less and populations decline. A Removal of predators would directly lower the number of herbivores. Some examples of predator and prey are lion and zebra bear and ...

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