Sharks
Sharks
.
have
.
been
.
around
.
for
.
a
.
very
.
long
.
time,
.
even
.
longer
.
than
.
dinosaurs.
.
They
.
have
.
a
.
skeleton
.
that
.
is
.
strong,
.
yet
.
it
.
bends.
.
The skeleton of a shark is.........
strong
Sharks
.
have
.
gills
.
on
.
the
.
sides
.
of
.
their
.
heads
.
that
.
help
.
them
.
breathe
.
underwater.
.
The
.
whale
.
shark
.
is
.
the
.
biggest
.
shark.
.
It
.
can
.
grow
.
up
.
to
.
40
.
feet
.
long.
.
The biggest shark is the .......................
whale shark
Sharks
.
help
.
control
.
the
.
amount
.
of
.
fish
.
in
.
the
.
ocean.
.
A whale shark can grow to be ..........................
40 feet
Many
.
sharks
.
are
.
overfished,
.
so
.
they
.
are
.
in
.
danger.
.
Up
.
to
.
100
.
million
.
sharks
.
are
.
killed
.
each
.
year
.
by
.
humans.
.
Sharks
.
need
.
to
.
be
.
protected.
.
About how many sharks are killed per year by humans?
about 100 million