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Bacteria
may
be
conveniently
grouped
under
two
heads:
those
that
live
upon
dead
organic
matter,
known
as
the
saprophytic
forms,
and
those
that
are
found
in
living
plants
or
animals,
the
true
parasites.
Such
a
grouping
is
not
always
entirely
satisfactory,
for
many
of
the
kinds
that
live
saprophytically
under
normal
conditions
may
become
parasitic
if
opportunity
offers,
and
also
many
of
those
that
are
usually
regarded
as
parasitic
may
be
grown
in
cultures
of
agar
or
other
media,
under
which
conditions
they
may
be
regarded
as
living
saprophytically.
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