Transcript living things and abiogenesis

Characteristics of living things

Composed of one or more cells
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Can reproduce either sexually or asexually
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Grow and develop
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Use energy and raw materials from the
environment
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Respond to stimuli from their environment
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Have a life span
Origins of living things
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Abiogenesis
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This theory states that living things can
be transformed from non-living things.
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Ex: Frogs and fish from mud
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Ex: Flies from rotting meat
Seriously?
False!
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Abiogenesis was proven to be false in 1608
by F. Redi.
Redi used a controlled experiment to test
the hypothesis that rotting meat can be
transformed into flies
(and, as it turns out, it cannot!)
But what about for microbes?
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J. Needham
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Abiogenesis is true!
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Loosely sealed
meat broth had
mold and bacteria
even after boiling
Microbes must
have come from the
broth!
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Spallanzani
Abiogenesis isn't
true!!
Boiled flasks of
broth longer and
completely sealed
them
No microbes found!
Pasteur
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This dude also didn't believe in Abiogenesis
for microbes
He finally proved it wrong by using swan
necked flasks in his experiments. (microbes
do NOT come from non-living things)
Read more about it....pg 20-22, 28-29
and do...pg 30 # 1 – 5, 7, 8