Complete the notes below. Write ONE WORD ONLY for each answer.

The effects of environmental change on birds
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 (31) ..................

Research on effects of mercury on birds
• Claire Varian Ramos is investigating:
o The effects on birds’ (32) ................. or mental processes e.g. memory
o The effects on bird song (usually learned from a bird’s (33) ...................... )
• Findings:
o Songs learned by birds exposed to mercury are less (34) .................
o This may have a negative effect on birds’ (35) ....................
• Lab based studies:
o Allow more (36) ............... for the experimenter

Implications 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)................