What gas was absent in early Earth's atmosphere? - Oxygen, What mineral-rich environment supports early life? - Vents, What was the main solvent for early life? - Water, What is the name of the ancestor of all life forms? - LUCA (Last Universal Common Ancestor), What element is essential for organic compounds? - Carbon, What molecule replaced RNA as the primary genetic material? - DNA, What atmospheric layer blocks UV? - Ozone layer, What is the term for stable internal conditions in living organisms? - Homeostasis, What is the dominant gas in Earth’s reducing atmosphere? - Methane, What field of science studies the origin of life? - Abiogenesis, What the main characteristic of autotrophs? - Self-sufficiency, Earliest evidence of life comes from.... (layered structures created by microorganisms - stromatolites,

OUR ACTIVE EARTH

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