Understanding Bioluminescence in Marine Biology

During a particularly interesting lecture on marine biology, the professor explained how certain fish exhibit bioluminescence. This phenomenon allows them to emit light in the dark depths of the ocean. However, he noted that not all fish are capable of this incredible ability; only a select few possess the necessary adaptations to glow in the dark. The professor went on to describe how these bioluminescent fish often use their light for various purposes, such as attracting prey or communicating with each other. He concluded by saying that studying these creatures provides valuable insights into evolutionary biology and the unique habitats they inhabit.

In this context, which word best completes the sentence: "Only a select few fish possess this amazing ability, making bioluminescence quite __________ among marine creatures."