Related topics: species

Oxygen's ups and downs in the early atmosphere and ocean

Most researchers imagine the initial oxygenation of the ocean and atmosphere to have been something like a staircase, but with steps only going up. The first step, so the story goes, occurred around 2.4 billion years ago, ...

The more the merrier -- farmers must diversify to survive

Aside from market fluctuations and changes in commodity prices, climate variability is the greatest threat to the long-term economic viability of dryland farms. In order to counter these uncertainties, many farmers have turned ...

Dell wins bidding to buy Quest Software for $2.4B

(AP) — Dell is buying Quest Software for $2.4 billion to expand its offerings as its personal computer business weakens in an era of smartphones and sleeker devices like the iPad.

Mass extinctions reset the long-term pace of evolution

A new study indicates that mass extinctions affect the pace of evolution, not just in the immediate aftermath of catastrophe, but for millions of years to follow. The study's authors, University of Chicago's Andrew Z. Krug ...

Diversification of land plants

Researchers have reconstructed phylogenetic relationships among all 706 families of land plants.

Oldest organism with skeleton discovered in Australia

A team of paleontologists has discovered the oldest animal with a skeleton. Called Coronacollina acula, the organism is between 560 million and 550 million years old, which places it in the Ediacaran period, before the explosion ...

page 4 from 6