Question

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. further research by dr. sparks and his team has revealed that many biofluorescent fish rely on similar filters. these filters, like internal camera filters, allow fish to perceive the biofluorescent patterns on other sea creatures. why exactly these patterns are important has yet to be determined. however, dr. sparks has presented a cogent theory, which has been well received among his peers. his compelling hypothesis is that the patterns play an important role in within - species communication. what is the meaning of conundrum as used in the passage? error goal difficulty

Explanation:

The context mentions that Dr. Sparks and colleagues had to address a 'technical conundrum' due to the unique properties of biofluorescence making it hard to photograph. This implies it was a difficult problem. The word 'conundrum' means a confusing and difficult problem or question. Among the options, 'difficulty' best matches this meaning.

Answer:

difficulty