Earth's History Crossword

The gas absent from earth's early atmosphere
Preserved evidence of an organism
Type of a fossil that traps an organism in tree sap
Type of fossil that is an indirect evidence left by an organism
A method used to determine the age of rocks by comparing them with those in other layers
Law stating that younger layers of rock are deposited on top of older layers.
The idea that life arises from non life
Italian scientist who did the meat and fly experiment (Last name only)
Theory of __________ states that only living things can produce other living things
Alexander Oparin and John Haldane gave the _____________ soup hypothesis about the origin of life.
Miller-__________ experiment showed for the first time that organic molecules could be produced from the gases in the earth's atmosphere
__________ Particles in the soil allowed amino acids to assemble together and create proteins
The first cells that existed 3.5 billion years ago were
Photosynthesizing bacteria saturated the atmosphere with this gas
____________ theory suggests that ancestors of eukaryotic cells lived in association with prokaryotic cells