Edexcel GCSE Chemistry · 1CH0
Specification 8.22 · Paper 2
Revise: Increase of OxygenOne important change began as primitive plants and other early photosynthetic organisms grew and became more widespread.
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GCSE Chemistry · key term
Early, relatively simple photosynthetic organisms that used carbon dioxide and released oxygen.
Used by Edexcel
Specification 8.22 · Paper 2
Revise: Increase of OxygenOne important change began as primitive plants and other early photosynthetic organisms grew and became more widespread.
Build the explanation as a causal chain: primitive plants grew → more photosynthesis occurred → carbon dioxide was used and oxygen was released → atmospheric oxygen gradually increased.
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