B
1 and 4
Sentence 1 explains what fluorescence is and how it occurs, while sentence 4 suggests that fluorescence can help animals of the same species find each other and potentially recognize each other from a distance. Together, these sentences provide support for the idea that fluorescence is useful to animals.
Read the list of sentences from the article.
1. This ability to glow is known as fluorescence, which happens when light is absorbed as one wavelength and emitted as another wavelength.
2. Fish, frogs, birds and reptiles have been known to fluoresce.
3. One potential explanation for that fact is that having a fluorescent coat could help nocturnal animals become more visible to potential partners.
4. Fluorescence might help members of a species find each other and perhaps recognize each other from a distance, Travouillon said.
Which two sentences taken together provide the BEST support for the idea that fluorescence is useful to animals?
A
1 and 2
B
1 and 4
C
2 and 3
D
3 and 4
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