Evolution
First Nitrogen-Fixing Organelle Confirmed
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Scientists have confirmed the existence of the first-ever nitrogen-fixing organelle in a eukaryotic cell, marking a key advancement in understanding cellular evolution and nitrogen cycles.
Dinosaur fossil reveals earlier evolution of sauropod long necks
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A newly discovered 230-million-year-old dinosaur fossil from Argentina suggests that the evolution of long necks in sauropods began much earlier than previously thought. Named Huayracursor jaguensis, the specimen shows early signs of neck elongation in a small, bipedal dinosaur. This finding challenges the idea of a gradual transition in sauropodomorph evolution.
Fossil fish rewrites otophysan evolution history
A tiny fossil fish discovered in southwestern Alberta is the oldest North American otophysan, offering new insights into the evolution of freshwater fish species. Named Acronichthys maccognoi, the 4 cm specimen from the Late Cretaceous period suggests otophysans transitioned from marine to freshwater environments at least twice. The find, detailed in a study published on October 2 in Science, challenges previous understandings of their global spread.
Evolution may explain why women outlive men
A new study suggests that the evolution of menopause plays a key role in women's longer lifespans compared to men. Researchers propose that post-reproductive life in women allows investment in grandchildren, contrasting with men's continued reproduction. This theory draws on data from hunter-gatherer societies and modern populations.