digestive system
Muscular System,
lymphatic system.
The endocrine system.
the muscular system
Because an organism is a being which contains organs and an organ system is a system of organs.
The digestive system
organ
The genitourinary system.
The digestive system contains the liver.
Circulatory System
It is an organ. A tongue is an organ because a group of tissues makes up an organ. A tongue is more than a tissue, so it must be an organ. Each type of tissue in the tongue performs an essential task to help the tongue function properly.
skeletal system
Digestive system.
the digestive system
lymphatic system.
The olfactory system.
Circulatory System.
the muscular system