9700/13 Biology May Jun 2019 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
شهریور
2019
مشاهده نمونه سوال
شامل مباحث:
AS Level
تعداد سوالات: 40
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
60 دقیقه
پیش نمایش صفحه اول فایل
Neda Bani A West African country introduced a measles vaccination during a measles epidemic.
Later, it was realised that vaccinated children were more likely to survive childhood than unvaccinated children, even when there were no measles epidemics.
The vaccine had given the children some protection against other pathogenic infections. Which statement could account for this extra protection?
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