Each segment has the same sets of organs and, in most polychaetes, has a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly defined or absent in others, and Echiura and Sipuncula show no obvious signs of segmentation.ach segment has the same sets of organs and, in most polychaetes, has a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly defined or absent in others, and Echiura and Sipuncula show no obvious signs of segmentation.
Chicxulub is most famous for being near the geographic center of the Chicxulub crater, an impact crater discovered by geologists on the YucatÃ¡n Peninsula and extending into the ocean. It was created by the impact some 65 million years ago of the Chicxulub impactor, an asteroid or comet which caused the CretaceousâPaleogene extinction event, which led to the demise of the dinosaurs.
9) The Yucatan Peninsula is home to many tropical rainforests and jungles and the area between Guatemala, Mexico and Belize is the largest continuous area of tropical rainforest in Central America. 10) The name Yucatan also includes the Yucatan state of Mexico that is located on the peninsula.It is a large state with an area of 14,827 square miles (38,402 sq km) and a 2005 population of 1,818,948 people.The capital of Yucatan is Merida.) The Yucatan Peninsula itself belongs to the Yucatan Platform-a large chunk of land that is partially submerged. The Yucatan Peninsula is the portion that is above the water. 2) It is believed that the mass extinction of the dinosaurs was caused by an asteroid impact in the Caribbean.