Biology

Front 1

biogenesis

Back 1

all living things come fron other living things

Front 2

spontaneous generation

Back 2

living things could arise from non living things.disproved

Front 3

Francesco Redi's experiments

Back 3

one jar with meat open left for adult flies to land on the meat another jar covered by netting not allowing flies to land on the meat.Maggots only on meat left open for 1668flies to land.proved flies come only from eggs laid by other flies. struck against spontaneous generation.

Front 4

Lazzaro Spallanzani

Back 4

experimented with meat broth.boiled conroll and experimental group to get rid of al microorganisms in flask inside of the glass and in the broth. Sealed one of the flasks in experimental group and kept controll group open. Controll:open:microorganisms.experimental:closed:no microorganims. concluded that broth only became contaminated with microorganisms when the air entered the flask. opponets believed in "vital force said that it had been destroyed when flasks where heated for too long.

Front 5

Louis Pasteur

Back 5

made curved neck flasks that allowed air inside the slask to mix with air outside the flask but did not allow solid particles, such as microorganisms to enter the body of the flasks. The broth then stayed clear for up to one year. When pasteur broke off the curved neck of the flask the broth became contaminated within a day. Disproved spontaneoud generation/vital force. BIOGENESIS became cornersone of biology.