Prehistoric fish pioneered sex

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Life on Earth has come a long way from the first simple microscopic organisms that sprang forth in the primordial soup billions of years ago to the great variety of plants and animals on the planet today. News Daily Headlines Receive our lunchtime briefing straight to your inbox. Of course, the implications of these findings extend beyond ichthyosaurs. Islamic State families surrender in Syria with anger and defiance. This fossilized tissue raised the question of how much fine detail the specimen might preserve, down to the molecular level. And now, an in-depth study of an exceptional ichthyosaur fossil has added new points of similarity between the marine reptiles of the past and the cetaceans of our modern seas, including a fatty, insulating layer of tissue called blubber.

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But just as species have changed over time, so too has the way they make their babies. The ground-breaking discovery suggests that external fertilisation evolved from internal fertilisation through sexual intercourse — and not the other way around. This fossilized tissue raised the question of how much fine detail the specimen might preserve, down to the molecular level. The Mystery of Lake Malawi. Subscribe Top Menu Current Issue. More From The Irish Examiner.

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For the sake of clarifying what "square-dance style" intercourse means, the gracious folks at Flinders University put together a visualization of what two antiarch placoderms having sex would look like. The hagfish is a slime-emitting ocean-dweller that's remained unchanged for million years--and it shows. The Mystery of Lake Malawi. Life on Earth has come a long way from the first simple microscopic organisms that sprang forth in the primordial soup billions of years ago to the great variety of plants and animals on the planet today. In a landmark discovery on the history of sexual reproduction described Sunday in the journal Nature , scientists have uncovered the first form of copulation , and in the most unlikely of animals - a now-extinct type of armored fish, called antiarch placoderms. But Long says humans and other copulating animals might still have antiarch placoderms to thank for paving the way. Although some contemporaneous species, like sharks, continue to thrive millions years later, placoderms were driven to extinction after a run of about 50 million years.

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