Fertilization
occurs
when
an
ovum
and
a
sperm
____________________
and
unite
.
This
union
creates
a
new
cell
called
____________________
.
The
____________________
then
,
starts
to
divide
and
grow
into
an
____________________
.
The
embryo
____________________
until
it
is
ready
to
survive
externally
,
then
it
is
____________________
.
In
viviparous
animals
the
____________________
develops
inside
the
____________________
womb
.
She
provides
the
embryo
with
the
____________________
it
needs
to
____________________
.
In
oviparous
animals
the
____________________
develops
inside
an
____________________
.
Then
it
____________________
.
