An exam may .... by our teacher today . 1- give 2- giving , 3- be given , 4- been given ... the bill has to ..... before leaving
2 answers:
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Answer:
Species interactions within ecological webs include four main types of two-way interactions: mutualism, commensalism, competition, and predation (which includes herbivory and parasitism). Because of the many linkages among species within a food web, changes to one species can have far-reaching effects.
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