Summary Grade 12 IEB Life Sciences/Biology Key Crads - Environmental Studies

Ecology The study of the interactions of
organisms with their physical and
biological environments and how these
determine the distribution and make up of
populations within an ecosystem.


Population ecology The fluctuations in the size of a
population and the physical and social
factors that regulates these fluctuations.




Organism An individual form of life, such as a
bacterium, fungus, protect plant or
animal, composed of a single cell or a
complex of cells that are capable of
growing and reproducing.


Individual A single organism capable of
independent existence.




Species A group of closely related organisms that
are very similar to each other and are
usually capable of interbreeding and
producing fertile offspring.



Population A group of organisms of the same
species that occupy the same area and
can breed freely with each other.




Community A group of different species that inhabit
and interact in a particular area.




Ecosystems Made up of groups of different species of
organisms that interact with each other
and with the environment.