a
)
Cells
that
perform
the
same
function
group
together
to
form
____________________
b
)
The
heart
and
blood
vessels
are
part
of
the
circulatory
____________________
c
)
The
heart
is
an
example
of
an
____________________
d
)
An
____________________
is
a
living
thing
e
)
The
smallest
living
unit
is
a
____________________
