DNA/Ecology (Examples of density-independent limiting
(Examples of density-independent limiting
factors include: unusual weathernatural disastersseasonal cyclescertain human activities—such as
damming rivers and clear-cutting
, CompetitionWhen populations become crowded, organisms
compete for food, water space, sunlight and other
essentials.Competition among members of the same species
is a density-dependent limiting factor.
, Population GrowthThree factors can affect population size:the number of birthsthe number of deathsthe number of individuals that enter or leave
the populationA population can grow when its birthrate is greater
than its death rate.