Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Atomic theory wikipedia , lookup
Organic chemistry wikipedia , lookup
History of molecular theory wikipedia , lookup
Transition state theory wikipedia , lookup
Physical organic chemistry wikipedia , lookup
Chemical thermodynamics wikipedia , lookup
History of chemistry wikipedia , lookup
Evolution of metal ions in biological systems wikipedia , lookup
Life What is it? Where did it come from? Classify the following as livingnonliving thigs What makes something a «living thing» ? A living organism is something that has the ability to: • Feed • Move • Breathe (Respiration) • Get rid of waste (Excretion) • Grow • Be Sensitive • Reproduce What is life? • Something´s ability to be born, grow, reproduce, die, and, after several generations, evolve. Where did life originate? - Creationism Theories that attempt to explain where life originated - Spontaneous generation - Panspermia - Chemical and cellular evolution Creationism Creationism • The belief that Earth, Universe and life were created by a supernatural being Spontaneous generation Spontaneous generation • States that living organisms develop from nonliving matter • Belief proposed by Aristotle. During 2000 years people thought this was true • Van Helmont: scientist that made an experiment proving this theory to be true • 1870: Thomas Huxley came up with the term abiogenesis • Italian scientist Reidi: First to doubt this theory • French scientist Pasteur proved the theory to be wrong Pasteur´s experiment Panspermia Panspermia • Life was created in outerspace and came into the Earth via meteors etc. • Anaxagoras- greek philosopher. First to propose this theory Chemical and cellular evolution Chemical and cellular evolution • States that life came from inert matter in times when Earth´s environment was very different from today´s Alexander Oparin: Energy from UV rays and electric discharges from thunderstorms + Gas molecules in the atmosphere = Organic molecules • Stanley Miller Made an experiment recreating the Earth´s atmosphere in order to prove Oparin´s experiment After a week he found organic compounds Homework • ON WEBSITE