Answer:
An experimental control is used in scientific experiments to minimize the effect of variables which are not the interest of the study. The control can be an object, population, or any other variable which a scientist would like to “control.”.
Explanation:
Navel is not an example of organ
12-A
15-B
11-C
6-D
1-E
10-F
8-G
9-H
5-I
3-J
7-K
14-L
4-M
13-N
2-O
