1. Where does life come from? Life Science
Notes Ch. 1.3
Where does life come from?
Life Science

2. Spontaneous Generation
There are many theories about how life came into existence. One theory was spontaneous generation: the idea that living things come from nonliving things. Louis Pasteur disproved the theory of spontaneous generation. After that the idea biogenesis came about. Biogenesis states that living things come only from other living things.
Spontaneous Generation

3. Louis Pasteur’s Experiment

4. Theories on how life began
Oparin’s Hypothesis: He suggested that the Earth’s early atmosphere had no oxygen but was made of the gases ammonia, hydrogen, methane, and water vapor. He hypothesized that these gases combined to make more complex compounds found in living things.
Theories on how life began