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Some animals grow up with an anus, but then lose it during their own lifetime. Scitable Chat. Science News. Although the researchers now use other methods to unravel the evolutionary relationship between animal groups, the division of Protostomia and Deuterostomia proposed by Grobben has demonstrated to be correct, with only some minor modifications. The anus from Latin anus meaning "ring", "circle" is an opening at the opposite end of an animal's digestive tract from the mouth. View image of This large flatworm has evolved multiple anuses on its back Credit: Cassandra Extavour. Take a deep breath and respond, "I'm sorry, I think you must have mistaken me for someone else.
The origin of the anus
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Embryological origins of the mouth and anus
Our puppy would struggle to eat and grow without it. Of course, those taboos have to have come from somewhere. These species, perhaps obviously, also lack an anus. They are researching a group of animals called Acoela, which, in evolutionary terms, are extremely primitive.
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Published: 17.08.2016 в 18:08
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