The smallest unit of an organism that is capable of showing
the three attributes of life. The three main components of
a eukaryotic cell are the cell membrane, the cytoplasm and
the nucleus. A prokaryotic cell does not possess a nucleus. A
multicellular organism consists of more than one cell (usually
many more). A specialised cell is one which specialises in the
performance of a particular function
Term describing the relationship between a species and its
habitat, the other species in the community and its method of
obtaining food and shelter.
The interrelationships between living organisms and their
environment; also used to refer to the study of those
Free-floating and mainly microscopic organisms, including some
that use photosynthesis, and some that use other means to
obtain their food.
The production by green plants (and some plankton) of
compounds containing organic carbon from carbon dioxide
and water, using the energy from solar radiation. Oxygen is
produced as a by-product.