the origins of life

Louis Pasteur

because he wanted to see if microbes could spontaneously generate in a nutrient broth.

1- 2 different flash, boiled water, bent the neck into S 2- broke of swan neck from 2nd flask 3- dust from the air fell into the 2nd flask but not 1s cus it remained near the tip fo the swan necks and could no travel against gravity 4- the 2nd flask became cloudy, full of microbes, the 1st one was clear

the luois pasteur experiment refuted the notion of spontaneouse generation

its the partial sterilization of certain counsumable products like: milk, cheese, juice, wine and beer

to destroy disease-causing bacteria and other undesirable oranisms

milk has to heat up for 30 minutes followed by a rapid cooling period

1- used molecules that represent the major components of the early earths atmosphere and put them into a closed system like: hydrogen, water(gas form), methane, ammonia. 2- ran electric current to stimulate electrical storm that used ot e common on early earth

compounds which are essential to cellular life, could be easily made under the conditions that scientist believed to be present on the early earth

• a population must have variation on order to best survive • some variations are considered favourable • offsprings that survive usually have favourable traits • a population will change over time

in Galapagos island

natural selection