There
are
1
.
____________________
of
specialized
cells
in
our
body
.
These
cells
always
grow
and
2
.
____________________
.
When
a
(
n
)
3
.
____________________
change
happens
,
cancer
will
4
.
____________________
.
5
.
____________________
cell
growth
creates
masses
of
tissues
called
6
.
____________________
.
The
two
types
of
tumors
are
benign
tumors
and
7
.
____________________
tumors
.
The
causes
of
cancer
may
be
some
8
.
____________________
traits
or
environmental
9
.
____________________
.
Excessive
sun
10
.
____________________
and
11
.
____________________
in
cigarettes
are
two
things
we
should
avoid
.
12
.
____________________
cancer
is
currently
the
most
prevalent
type
and
13
.
____________________
cancer
causes
the
most
deaths
.
Since
the
1990s
,
the
14
.
____________________
rates
of
cancer
have
decreased
significantly
.
15
.
____________________
are
being
improved
,
and
hope
remains
in
the
battle
against
cancer
.
