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Since annelids are soft-bodied, their fossils are rare mostly jaws and the mineralized tubes that some of the species secreted. Although some late Ediacaran fossils may represent annelids, the oldest known fossil that is identified with confidence comes from about 518 million years ago in the early Cambrian period. Fossils of most modern mobile polychaete groups appeared by the end of the Carboniferous, about 299 million years ago. Palaeontologists disagree about whether some body fossils from the mid Ordovician, about 472 to 461 million years ago, are the remains of oligochaetes, and the earliest indisputable fossils of the group appear in the Tertiary period, which began 65 million years ago.

What fossil signs of annelids are found?
Answer: jaws and the mineralized tubes that some of the species secreted
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In Andorra, Catalan has always been the sole official language. Since the promulgation of the 1993 constitution, several Andorranization policies have been enforced, like Catalan medium education.

When was the Andorran constitution produced?
Answer: 1993
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The on-again, off-again armistice negotiations continued for two years, first at Kaesong, on the border between North and South Korea, and then at the neighbouring village of Panmunjom. A major, problematic negotiation point was prisoner of war (POW) repatriation. The PVA, KPA, and UN Command could not agree on a system of repatriation because many PVA and KPA soldiers refused to be repatriated back to the north, which was unacceptable to the Chinese and North Koreans. In the final armistice agreement, signed on 27 July 1953, a Neutral Nations Repatriation Commission, under the chairman Indian General K. S. Thimayya, was set up to handle the matter.

What was deemed unacceptable to North Koreans and the Chinese during POW negotiations?
Answer:
many PVA and KPA soldiers refused to be repatriated back to the north