The levels of organization of life from the least complex to
most complex are enumerated below:
AOrganelles - the basic part of a living
organism. It refers to the different structures of the cell, whether
prokaryotic or eukaryotic. (Ex. Mitochondria, nucleus)
BCells - building blocks of life that are
composed of different molecules responsible for the function of an organism.
(Example: prokaryotic, eukaryotic cells)
CTissues - combinations of cells that carry
out a specific function in an organism. (Example: Human skin)
DOrgans - collections of tissues that perform
specific functions. (Ex. heart, lungs)
EOrgan Systems - composed of interconnected
organs that function as a whole. Many organisms, particularly mamamals, are
composed of organ systems. (Ex. respiratory, circulatory systems)
f. Organisms – individual entities that
specifically make-up a population. (Ex. Each tree in the forest is an organism,
each animal in sea is an organism)
g. Population – species living within a specific location. It
could be the same or different species that inhabit a place. (Ex. Birds are
species in the forest as well as bears)
h. Community – refers to the total number of populations that
inhabit a specific location. (Ex. All of the trees, insects, birds that inhabit
the forest are a community)
i. Ecosystem – consists of all living things that function
together as a group which also includes the non-living parts of the
environment. (Ex. Rain water, nitrogen in the soil)
j. Biosphere – the highest organization of life that consist
of all the collection of ecosystems in the planet. It includes the land, air,
water, even the atmosphere of the planet.
