Living Environment Translated Arabic 2014 | Page 76

14.When more than one organism needs the same resource,
competition occurs.
15.Competition limits population size.
16.Population size:
 Population density is the number of individuals that live in a
given area.
 Limiting factors are resources (food, water, air) that restrict
population size.
 An ecosystem’s carry capacity is the largest population that
it can support.
 Biotic potential is the highest possible rate of growth for a
population.
 Birthrates, death rates, and movement from place to place
affect population size.