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GCSE Combined Science · key term
Small organisms that drift in water, including microscopic aquatic plants and animals.
Used by AQA
Specification 5.9.1.4 · Paper 4
Revise: Decrease of Atmospheric Carbon DioxideCrude oil and natural gas formed mainly from the remains of tiny aquatic organisms called plankton. When they died, their remains settled on the seabed and became covered by mud and other sediments.
Distinguish the starting materials: coal forms from plants, whereas crude oil and natural gas form from plankton.
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