Ecology
a scientific study of all the interrelationships between organisms and their environment.
Biosphere
a relatively thin layer of earth and its atmosphere that supports life
biotic factor
Any living factor in an organism-environment
abiotic factor
Any nonliving factor in an organism's environment such as oil, water, temperature, and light availability.
population
group of organisms of the same species that occupy the same geographic place at the same time.
Biological community
All the interacting populations of differents species live in the same geographic location at the same time.
ecosystem
Biological community and all the nonliving factors that affect it .
biome
large group of ecosystem that share the same climate and have similar types of communities.
habitat
physical are in wich an organism lives
niche
role or possition of an organism in its enviroment .
Predation
act of one organism feeding on another organism .
Symbiosis
close mutualistic parasitic , or commensal association between two or more species that live toguether .
Mutualism
symbiotic relashionship in witch both organism benefit .
commensalism
symbiotic relashionship in wich one organism benefits and the other organism is neither helped nor harmed.
parasitism
symbiotic relashionship in wich one organism benefits at the expense of another organism .