The
organs
are
composed
of
main
tissue
,
parenchyma
,
and
"
____________________
"
tissues
,
stroma
.
The
main
____________________
is
that
wich
is
unique
for
the
specific
____________________
,
such
as
,
the
____________________
,
the
main
____________________
of
the
____________________
,
while
sporadic
tissues
include
the
____________________
,
blood
____________________
,
and
connective
tissues
.
The
main
tissues
that
make
up
an
____________________
tend
to
have
common
embryologic
____________________
,
such
as
arising
from
the
____________________
germ
layer
.
Functionally
related
____________________
often
cooperate
____________________
form
whole
organ
____________________
.
Organs
exist
in
all
higher
biological
____________________
,
in
particular
they
are
not
____________________
to
animals
,
but
can
also
be
identified
in
____________________
.
In
single
-
cell
____________________
like
bacteria
,
the
functional
____________________
of
an
organ
is
called
____________________
.
