Edexcel Gcse Biology/additional Science - Unit B2 The Components Of Life Page 15
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3315
(i)
How much oxygen was needed in the
atmosphere for the evolution of land animals?
Put a cross
in the box next to your answer.
(1 mark)
A
0·009%
B
0·09%
C
0·9%
D
9·0%
(ii) Suggest how photosynthesis could have
changed the gas content of the atmosphere.
(2 marks)
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