Earth was mostly devoid of oxygen for much of its 4.5 billion year lifetime. That is, until certain processes started to ...

Microscopic ocean algae produce a huge share of Earth’s oxygen—but they need iron to do it. New field research shows that when iron is scarce, phytoplankton waste energy and photosynthesis falters.

During animal cell division, a highly synchronized and tightly regulated dance of chromosomes takes place, ensuring the ...