The most important structures to receive external stimulus are (1)__ and the system of these organs is called (2)__ .Two major sense organs are (3)__ and (4)__. The sense organs of human body are of (5)__ types.

The most important structures to receive external stimulus are (1)__ a

1.	The most important structures to receive external stimulus are (1)__ and the system of these organs is called (2)__ .Two major sense organs are (3)__ and (4)__. The sense organs of human body are of (5)__ types.
Answer» The most important structures to receive external stimulus are (1)__ and the system of these organs is called (2)__ .Two major sense organs are (3)__ and (4)__. The sense organs of human body are of (5)__ types.