Why did photographers travel with their darkrooms in the 1800's?

(choose all that apply)
Question 3 options:

The photograph had to be made and developed while the chemicals were still wet

The chemicals had to be applied to a plate, in the dark.

It was too dangerous to mix photo chemicals in a downtown building

They sold advertisements on the sides of the big wagons and they made most of their money that way.

The photograph had to be made and developed while the chemicals were still wet.

Explanation:

The emergence of photography during the nineteenth century And its development was not as simple as it is today. Photographers had to bring a lot of equipment with them to take a photo. The problem was also the situation when the photographer had to take a photo from inaccessible terrain. A photographer in the 19th century, after making a photograph, had to do the same now because, at that time, technology was not as advanced as it is today. This meant that the photographer had to have a dark room with him, as well as various dangerous chemicals that were necessary for the development of the photo.

a)scientists

explanation:

the national defense education act had two main goals. the first one was to provide personal that was oriented to defense, including scholars, engineering students and so on. the other goal was to provide financial assistance for the students who would be enrolling at colleges and universities in the 1960s.