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

(choose all that apply)

Question 3 options:

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

the chemicals had to be applied to the plate in the dark.

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

the chemicals had to be applied to the plate in the dark.

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

Explanation:

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

b. africa to the americas

explanation: