scientific study of all the interrelationships between organisms and their environment.
a person who specializes in biology.
relatively thin layer of Earth and its atmosphere that supports life.
any living factor in an organism's environment.
any nonliving factor in an organisms environment, such as soil, water temperature, and light availability.
group of organisms of the same species that occupy the same geographic place at the same time.
all the interacting populations of different species that live in the same geographic location at the same time.
biological community and all the nonliving factors that affect it.
large group of ecosystems that share the same climate and have similar types of communities.
physical area in which an organism lives.
role, or position, of an organism in its environment.
act of one organism feeding on another organism.
close mutualistic, parasitic, or commensal association between two or more species that live together.
symbiotic relationship in which both organisms benefit.
symbiotic relationship in which one organism benefits and the other organism is neither helped nor harmed.
symbiotic relationship in which one organism benefits at the expense of another organism.