Populations
can
change
through
three
processes
:
fertility
,
mortality
,
and
migration
.
Fertility
involves
the
number
of
children
that
women
have
and
is
to
be
contrasted
with
fecundity
(
a
woman's
childbearing
potential
)
.
Mortality
____________________
the
causes
,
consequences
and
measurement
of
processes
affecting
death
in
a
population
.
Demographers
most
commonly
study
mortality
using
the
Life
Table
,
a
statistical
____________________
which
provides
information
about
the
mortality
conditions
(
most
notably
the
life
expectancy
)
in
the
population
.
Migration
refers
to
the
movement
of
persons
from
an
origin
place
to
a
destination
place
across
some
pre
-
defined
political
boundary
.
Migration
researchers
do
not
designate
movements
as
migrations'
____________________
they
are
somewhat
permanent
.
Thus
demographers
do
not
consider
tourists
and
travelers
to
be
migrating
.
While
demographers
who
study
migration
typically
do
so
through
census
data
on
place
of
____________________
,
indirect
sources
of
data
including
tax
forms
and
labor
force
surveys
.
