Which statement is true about the use of airplanes in the beginning of world war i?
1) the first aircrafts were unarmed and were used for gathering information.
2) the first aircrafts were armed with machine guns for aerial combat.
3) the first aircrafts were used to deploy bombs on enemy cities.
4) the first aircrafts were used to disperse chemical gas on enemy trenches.

 The correct answer is :  1) The first aircrafts were unarmed and were used for gathering information.

Explanation:   Airplanes such as B.E.2 were used at the beginning of the first world war for reconnaissance work, since it was the only thing that could be used to gather information beyond the trenches of the enemy army, in order to know their strategies and movements.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

answer; biological;