So why do so many life-forms breathe oxygen? There are probably thousands of kinds of metabolisms, or chemical processes that ...

Oxygen is also produced. Time for a demo here ... or by eating other animals that have already eaten plants. Plants are the most fundamental part of the food chain. Photosynthesis is essential ...

A novel industrial reactor that produces steel using only electricity ... The carbon in the coke reacts with oxygen released from iron oxide to form carbon dioxide. Researchers at MIT developed ...

Oxygen is also produced. Time for a demo here ... or by eating other animals that have already eaten plants. Plants are the most fundamental part of the food chain. Photosynthesis is essential ...