TEST 247Cambridge IELTS 12 · Questions 31–40The Effects of Environmental Change on BirdsComplete the notes below.Write ONE WORD ONLY for each answer.The effects of environmental change on birdsMercury (Hg)–Highly toxic–Released into the atmosphere from coal–In water it may be consumed by fish–It has also recently been found to affect birds which feed on 31Research on effects of mercury on birds–Claire Varian-Ramos is investigating–the effects on birds' 32 or mental processes, e.g. memory–the effects on bird song (usually learned from a bird's 33 )–Findings:–songs learned by birds exposed to mercury are less 34–this may have a negative effect on birds' 35–Lab-based studies–allow more 36 for the experimenterImplications for humans–Migrating birds such as 37 containing mercury may be eaten by humans–Mercury also causes problems in learning 38–Mercury in a mother's body from 39 may affect the unborn child–New regulations for mercury emissions will affect everyone's energy 40