The Effects of Environmental Change on Birds — Test 7, Section 4
IELTS_ACADEMIC · Ielts Listening Section · Cambridge IELTS 12 Academic, Cambridge University Press
Listen to the recording once and answer all the questions in this section.
Mercury (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 ___ Research on effects of mercury on birds • Claire Varian-Ramos is investigating: – the effects on birds' ___ or mental processes, e.g. memory – the effects on bird song (usually learned from a bird's ___ ) • Findings: – songs learned by birds exposed to mercury are less ___ – this may have a negative effect on birds' ___ • Lab-based studies: – allow more ___ for the experimenter Implications for humans • Migrating birds such as ___ containing mercury may be eaten by humans • Mercury also causes problems in learning ___ • Mercury in a mother's body from ___ may affect the unborn child • New regulations for mercury emissions will affect everyone's energy ___
IELTS_LISTENING_FORM_COMPLETION
The effects of environmental change on birds
ONE WORD ONLY
Complete the notes below. Write ONE WORD ONLY for each answer.
A lecturer explains how mercury released into the environment affects birds, and what that implies for humans.
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