Parasitism: A relationship similar to predation in that one organism benefits while the other is harmed.
Commensalism: Only one species benefits while the other is neither helped or harmed.
Mutualism: Both partners benefit
Population Density and Dispersion
Population Density: Population per unit area
Clumped population dispersion: When the population clumps together rather than spreading out
Uniform Population Dispersion: When there is a pattern to the spread of population
Random Population Dispersion: No predictable pattern
Population size: The number of individual organisms in a population. Determined by 4 factors.