For now, life is flourishing on our oxygen-rich planet, but Earth wasn't always that way – and scientists have predicted that ...

However, photosynthesis doesn't just drive the carbon cycle — it also creates the oxygen necessary for respiring organisms. Interestingly, although green plants contribute much of the oxygen in ...

The growth of these forests removed huge amounts of carbon dioxide from the atmosphere, leading to a surplus of oxygen. Atmospheric oxygen levels peaked around 35 percent, compared with 21 percent ...

Sierra Space’s system does require the addition of some carbon, though the firm says it can recycle most of this after each oxygen-producing cycle. Along with colleagues, Palak Patel ...

Sparse cultures of embryonic fibroblasts were synchronized in the G 0 portion of the cell cycle by serum starvation and then placed under either low (2.5%) or ambient (20%) oxygen for 24 hours.