Which level of organization would occur after the cellular level but before the organ level

With the exception of single-celled organisms and very simple life forms, living things have complex bodies that contain many functional parts. You can organize these parts into different levels of complexity or cellular organization. They range from the smallest, simplest functional units of living things to the largest and most complex.

can you make it bigger i can't see it

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate