The study of the interactions between living and nonliving things.
A group of interbreeding organisms coexisting together.
A group of populations living and interacting in the same area.
An association of living organisms and their physical environment.
A group of ecosystems classified by climate and plant life.
An organism that eats producers.
An organism that eats primary consumers.
An organism that eats secondary consumers.
A diagram that shows the biomass of organisms at each tropic level.
A measure of the total dry mass of organisms within a particular region.
Evaporation of water from the leaves of a plant.
An ecosystem where all water runoff drains into a single body of water.
The process by which certian gases (mainly water vapor, carbon dioxide, and methane) trap heat that would otherwise escape the earth and radiate into space.