9700/13 Biology Oct Nov 2019 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
بهمن
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
The graph shows how the body reacts following exposure to an antigen for the first and second time.
What is the direct cause of the increase in antibody production after the second exposure to antigens?