AS & A Level Marine Science (9693) — October–November 2023, Paper 21
4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 22 marks · Mangroves and ecosystems
Define the term ecosystem.
Answer this question and get it marked →Question 2 · 14 marks · Sampling and Spearman's rank correlation
A student investigated the relationship between macroalgae percentage cover and the number of crabs found in quadrats on a mangrove mudflat. Describe how the student could use…
Answer this question and get it marked →Question 3 · 19 marks · Red snapper and coral reef
Fig. 3.1 shows a photograph of a red snapper fish. Make a large, labelled drawing of the outline of the fish shown in Fig. 3.1.
Answer this question and get it marked →Question 4 · 20 marks · Amazon coral reef
In 2016 scientists located a previously unknown coral reef near the mouth of the Amazon River. Fig. 4.1 shows the location of the mouth of the Amazon River, the coral reef…
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