There were frequently change of constitution in nepal mention any four reasons

Nepal is a country that frequently gone under governance change and various changes in the society and its structure leads to the frequent change in its constitution.

- The first change in the constitution The Government of Nepal act 1948, was changed due to no democratic rights present in it.

- In the year 1959, the first democratic constitution was enacted. The King of Nepal felt that the constitution makes his powers less so scrapped it.

- The next constitution of 1962, scrapped due to its anti-democratic laws

-In 1990, the king again changed the constitution for his own personal interests.

For this, the constitution of the country undergoes frequent changes.  

the consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.

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.