Question

select the text from the paragraph that best helps you understand that conundrum means difficulty. there may be more than one correct choice. for these discoveries to be seen, dr. sparks and his colleagues first had to address a significant technical conundrum presented by the unique properties of biofluorescence. the light that biofluorescent creatures emit is not visible to the human eye. as a result, biofluorescence is impossible to photograph using traditional methods and equipment. the scientists ultimately decided to shine a high - energy blue light on the fish they were attempting to photograph. this light mimicked the light of the ocean and triggered the fishs biofluorescence. the researchers also outfitted their camera lens with a specially designed filter that removed the unwanted blue light from the image, allowing the fluorescent light to be more clearly seen

Explanation:

The text mentions that Dr. Sparks and colleagues had to address a "significant technical conundrum" due to biofluorescence properties making it hard to photograph. The description of the problem with biofluorescence - light not visible to human eye and hard to photograph with traditional methods - shows it's a difficulty.

Answer:

"a significant technical conundrum presented by the unique properties of biofluorescence. The light that biofluorescent creatures emit is not visible to the human eye. As a result, biofluorescence is impossible to photograph using traditional methods and equipment."