Q22 · 2023 · Paper 1Unclassified2 marks
QUESTION 22 (2 marks)
Describe two ways bacteria assist matter to cycle through ecosystems.
WORKED SOLUTION
2 marksQCAA guide · typeset solution
QCAA sample response and mark allocation
QCAA sample response and marking criteria reproduced from the official guide.
How many marks did you earn?
Compare your working with the guide above.