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While ice-free summers are expected to be rare at 1.5 °C degrees of warming, they are set to occur once every three to ten years at a warming level of 2 °C. [199] Higher atmospheric CO 2 concentrations cause more CO 2 to dissolve in the oceans, which is making them more acidic . [ 200 ]
In one incident concerning the 2016 GCSE biology exam, there were complaints about the apparent lack of biology content in the exam. [65] [66] [67] One of the questions in the biology exam asked students to define an "independent company", which some students perceived to be a business studies question. [68]