VI. Species Interaction
A. Competion – two species compete for the same scarce resources; both species are harmed
1. Intraspecific – among same species
2. Interspecific – between different species
B. Predation – member of one species (predator) feeds on an organism of other species (prey_; prey is harmed; predator benefits the population level; predator can benefit prey by helping regulate the population size and improving genetic stock
C. Symbiotic – close relationship between two organism in which one lives near or even inside the organism in which at least one organism benefits
1. Parasitism – parasite: prey on another; host: harmed
2. Mutualism – members of different species interact in ways that benefit both species
3. Commensalism- benefits one species but neither harmed nor helped the other species much
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