uterus oxygen sperm Pregnancy baby male egg placenta umbilical zygote uterine nutrients embryo fallopian female
begins
in
the
,
where
a
fertilizes
an
.
If
the
sperm
carries
an
X
chromosome
,
the
will
become
,
while
a
Y
chromosome
will
result
in
the
baby
becoming
.
fertilized
egg
,
or
,
divides
repeatedly
as
it
travels
through
the
tube
,
implanting
itself
on
the
wall
to
form
both
the
and
a
specialized
organ
known
as
the
placenta
.
The
will
manage
waste
and
provide
,
,
and
hormones
via
the
cord
.