AS & A Level Marine Science (9693) — October–November 2023, Paper 23

4 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.

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Question 1 · 22 marks · Mangroves and ecosystems

Mangrove forests are important ecosystems. Explain the term ecosystem.

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Question 2 · 14 marks · Sampling and Spearman's rank correlation

A group of students investigated how the distribution of crabs on a rocky shore varied with macroalgae cover. The students used random sampling to select 10 areas of the shore.…

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Question 3 · 19 marks · Red snapper and coral reef

Fig. 3.1 shows a red snapper, a fish commonly harvested for human food from coral reefs. Make a large drawing of the red snapper in Fig. 3.1. Do not include the scales.

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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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