Metabolism, not cells or genetics, may have begun life on Earth

Metabolism, not cells or genetics, may have begun life on Earth

Planet Earth is overrun with life. Lakes, rivers, seas, and oceans are teeming with it, from the surfaces all the way down to the bottom, often at depths of miles and miles. The land, both above and below ground, is packed with living organisms of varying size, mass, and complexity, including plants, animals, and fungi. Even the atmosphere houses a wide variety of life forms, from birds and insects to microbes found far above the highest mountai…