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一 |     为培养学龄前儿童的交通安全意识，帮助他们掌握基本安全常识，提高自我保护能力，有效预防道路交通事故发生，日前，我市公安交警部门联合市教育局开展学龄前儿童交通安全课堂进校园活动，走进全市各幼儿园，为广大学龄前儿童和家长送去一堂生动、有趣的交通安全教育课。         　　活动中，交警以安全儿歌、图片、视频、展板等丰富形式讲解交通安全知识，帮助小朋友、老师和家长了解文明出行的重要性，引导他们主动遵守交通规则。同时，还通过现场问答、互动的方式教孩子们认识各种道路交通标志和通行规则，熟悉交警指挥手势，进一步提升孩子们的安全出行意识。                    责任编辑：李丹。    Researchers from China and the UK have solved the mystery surrounding Saccorhytus coronaries – a millimeter-long spiny creature that was found in 2017 and believed to have inhabited oceans 500 million years ago. The veil of mystery over the critter persisted for years, as the scientists could not locate the creature’s anus. Turns out – they should not have even tried.,The critter was originally determined to be a member of a deuterostomes group of animals - the ancestors to the modern vertebrates (including humans). However, scientists' latest research suggests that it actually belongs to another group called ecdysozoans – the predecessors of the modern spiders and various insects. As it turned out, the whole mishap happened over the creature's anus – or rather lack thereof.,Ecdysozoans normally have an anus and hence the critter was initially ruled not to belong to them. But, upon closer discovery using x-rays, scientists saw it resembles ecdysozoans internally more than the ancestors of the vertebrates.,Like them, Saccorhytus has a large mouth and also features tiny holes around it that served as bases for spines that kept the critter anchored in one place. Those holes also served as a source of confusion as they were originally believed to be gills – another mark of the proto-vertebrates.,'Ugliest I've Ever Seen': Fisherman Shares Pic of Mysterious Creature He Found in Australia29 June, 13:17 GMT,As to Saccorhytus' absence of anus, scientists are yet to find out what happened to it. One theory suggests that there was an even earlier representative of ecdysozoans that has not been discovered, but did not have an anus.,Another theory goes that Saccorhytus did not actually need one.,"It could be that it lost it during its own evolution - perhaps it didn't need one because it could just sit in one spot with one opening for everything," Emily Carlisle, one of the researchers, said.。

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