Origin of LifeThere are numerous theories as to how life

began. Some of the most popular ones include:DIVINE ORIGINS

The BIG BANG THEORYMETEORITE

PRIMORDIAL SOUPBUBBLE THEORY

BIG BANGUniverse was created by a giant explosionAll matter moved out and away from central

condensed ball of matterStars and planets were createdUniverse is still expandingRelates to meteor theory

PRIMORDIAL SOUPMost widely held theoryEarth’s oceans were a primordial soup full of

organic matterEnergy from the sun, volcanoes, and

lightningfueled chemical reactions the combined the molecules into amino acids, lipids, and other complex organic molecules

PRIMORDIAL SOUP

Several billion years ago Earth’s atmosphere had no free oxygen. Elements/chemicals were only in the atmosphere

When the earth cooled elements entered the oceans

Primitive oceans filled with organic chemicals were called the primordial soup

Since the 1950’s scientists have shown that amino acids will link together to form proteins when heated to form parts of a cell

Protocell=a primitive cell-like ordered structure that carried out growth, cell division, or metabolism

Biogenesis= beginning of life: protocells were formed from inorganic chemicals precursors to prokaryote cells

Endo= inside or withinSymbiotic= relationship between living organisms

Eukaryotic protocells engulfed prokaryotic bacterial cells which could carry out photosynthesis and cellular respiration

The eukaryotic cells then contained pre-chloroplasts and pre-mitochondria which evolved into plant-like protists (ancestors of eukaryotes on earth today)

Endosymbiotic diagram