Fossil fish rewrites otophysan evolution history

5. oktober 2025 Rapportert av AI

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.

First Nitrogen-Fixing Organelle Confirmed

12. september 2025 Rapportert av AI

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.

Rodent Evolution Study on Hand Structures

A study on the evolution of rodents emphasized the importance of hand structures, featured in Science Magazine's September 4, 2025, issue. It explores 'rules of thumb' in rodent development.