Scientists are looking for the roots
of life, looking for the first organisms
that appeared on earth. Was there
one cell from which all other life forms
are descended? So far the answer
seems to be no. LIfe may have come
out of a community of tiny organisms
struggling to be alive.
One way of
studying this is to compare the DNA of
different species of micro-organisms and
also of more complex life forms.
So far the scientists have not found one
cell that is the beginning of everything
alive here. Rather they have found
hints of our beginnings which are
Based on what they know today,
scientists have divided living
creatures into three domains.
Each domain consists of groups of life
forms that are related to each other and
have characteristics in common. We
are looking at these domains now because
they are the most fundamental divisions
of life forms. These domains
describe the characteristics of every
living creature that we know
about. Learning about them is an
important part of this unit.
the domain that you would like to read
Header by Viau
in lily pond
1996,1997, 1998, 1999,
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