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Good and bad bacteria with Mrs Green

Collecting samples of bacteria using bread.

Collecting samples of bacteria using bread. 1
Collecting samples of bacteria using bread. 2
Collecting samples of bacteria using bread. 3
Collecting samples of bacteria using bread. 4
Collecting samples of bacteria using bread. 5
Collecting samples of bacteria using bread. 6
Collecting samples of bacteria using bread. 7
Collecting samples of bacteria using bread. 8
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Collecting samples of bacteria using bread. 10
Collecting samples of bacteria using bread. 11
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Collecting samples of bacteria using bread. 13
Collecting samples of bacteria using bread. 14