Nhận biết (M1)

Moving beyond a simple “present or absent” designation, researchers created a new classification system that allows for a nuanced understanding of bioluminescence in marine organisms that was unavailable under binary classification systems. The new six-point scale considers varying levels of supporting evidence used to identify bioluminescent species. For example, the firefly squid scores 1 because of inconsistent reports, the emperor squid scores 4 because of its anatomical similarity to known luminous relatives, and the shaggy anglerfish scores 6 because of substantiated direct observations.

Which choice best describes the function of the underlined sentence in the text as a whole?

• A.

  It emphasizes the thoroughness of the research conducted.

• B.

  It explains how the new classification system was derived from the previous binary system.

• C.

  It justifies the need for a new classification system for marine species.

• D.

  It explains the basis for the new system’s scoring criteria.