Q4 · 2022 · Paper 2Unclassified1 mark
QUESTION 4 (1 mark)
Define keystone species.
WORKED SOLUTION
1 markQCAA guide · typeset solution
QCAA sample response and mark allocation
4 | A plant or animal that plays a unique and crucial role in the way an ecosystem functions. | • provides an appropriate definition [1 mark] |
QCAA sample response and marking criteria reproduced from the official guide.
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