Final answer:
The development of photography was not solely reliant on the camera and roll film, but a series of advancements including daguerreotypes, wet collodion method, dry glass plates, and ultimately, roll film and accessible cameras by George Eastman.
Step-by-step explanation:
The statement that photography was made possible by just two scientific advancements, the development of a camera and roll film, is a simplification. It overlooks the numerous technological advancements and materials that contributed to the evolution of photography throughout the 19th century.
The chronological development of photography included important milestones like the invention of the daguerreotype process in 1839 by Louis Daguerre, which greatly reduced exposure times, and the emergence of the wet collodion method, which despite its faster exposure times compared to earlier methods, required the photographer to develop the glass plates while the chemical coating was still wet, introducing the inconvenience of carrying around portable darkrooms.
Significant progress continued with the invention of the dry glass plate in 1867, easing some of the previous burdens. George Eastman played a pivotal role in making photography widely accessible by developing the dry gelatin roll film in 1888, which replaced glass plates, and by producing the first small inexpensive cameras known as Kodaks.
Further advancements, such as Eadweard Muybridge's experiments with motion pictures in 1878, and the earlier instances of cameras used to capture static images, underscore the complexity of photography's evolution. Finally, by the 20th century, photographs became both a chemical and electronic record of an image, with the rise of digital cameras and computers changing the face of photography once again.