Internal
fertilization
occurs
when
a
____________________
and
an
____________________
meet
and
unite
.
The
union
of
a
____________________
and
an
____________________
creates
a
new
cell
called
a
____________________
.
Then
it
starts
to
divide
and
grow
into
an
____________________
.
The
____________________
develops
until
it
is
ready
to
____________________
externally
,
then
it
is
____________________
.