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.
Tulum mayan ruins. Coba. Located in the state of Quintana Roo Mexico at 42 km. west of Tulum. With many buildings still covered by jungle, Coba is over 80 sq. miles with 5 lakes. Nohoch Mul is the tallest pyramid in the Yucatan peninsula. It is 12 stories tall and has 120 steps to the top! But from the top you can view a magnificent span of jungle with the tops of other ruins reaching above the jungle canopy... Coba mayan ruins. Uxmal. Located in Yucatan Mexico and some of the best on the peninsula. The name Uxmal means 'thrice-built' in Mayan, referring to the construction of its highest structure, the Pyramid of the Magician.