【单选题】The following passage is organized by the structure of ________. The Green sea turtle and the loggerhead sea turtle nest along the Atlantic and the Pacific shores in the United States. The Green sea turtle is on the endangered list while the Loggerhead is listed as threatened. The Green sea turtle eats grass, algae and other vegetation and is classified as herbivorous. Unlike the Green sea turtle, the Loggerhead turtle is classified as carnivorous, and eats horseshoe crabs, clams, and mussels. Both sea turtles live in temperate and subtropical waters and tend to stay near the coastline.
A、chronological sequence
B、compare and contrast
C、cause and effect
D、deduction