A new study explains how climbing down trees helped shape upright posture in early primates and changed the course of evolution.

Life on Earth may have learned to breathe oxygen long before oxygen filled the skies. MIT researchers traced a key oxygen-processing enzyme back hundreds of millions of years before the Great ...

During photosynthesis, trees convert the carbon dioxide to sugars and in doing so produce oxygen as a biproduct, which is vital for life on Earth. “Trees draw carbon dioxide out of the atmosphere and ...

This football-sized creature could grind its teeth like a hard-core plant-eater, back before that was really a thing — and it may be the earliest vertebrate herbivore ever found.