Fig. 5.1 depicts people fishing on both a large scale and a small scale. Every kind of fishing may have a harmful effect on fish stocks.
(a)[6]
Discuss how governments may regulate fishing in order to keep fish stocks at a sustainable level. Use the word sustainable in your answer.
(b)[2]
State and explain what type of chemical the factory may be discharging into the river that would lead to the effects shown in Fig. 5.3.
(c)[1]
State how human sex is inherited.
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