TEXTO:
Electrical devices may disrupt the migration of
some birds, a study suggests. A German team has found
that electromagnetic fields produced by equipment and
AM radio signals affect the animals’ navigational
[5] systems. The study is published ∈ the journal Nature.
Some birds perform remarkable feats of navigation,
migrating halfway around the world. And it’s thought that
a built−∈ compass, which senses the Earth’s magnetic
field, helps them to find their way.
[10] But this latest study suggests that low frequency
waves produced by devices plugged into the mains
electricity, could be interfering with this ‘inner satellite
navigation system’. Scientists found that migratory birds
exposed to this electromagnetic noise lost all sense of
[15] direction. But when the field was blocked out, they found
their bearings again.
Researchers believe electrical interference could
be a particular problem when birds fly over urban areas.
They think the birds are forced to switch to back-up
[20] navigational systems, staying on course using the sun
and stars instead.
MORELLE, Rebecca. Disponível em: . Acesso em: 13 out. 2014.
Fill ∈ the parentheses with T (True) or F (False).
It’s stated ∈ the text:
( ) During the winter, all birds travel to a warmer place of the world.
( ) When migrating, birds may be thrown off course by radio waves.
( ) Birds are believed to be equipped with a kind of device that helps them establish their location on Earth.
( ) Low frequency waves were found to be harmless to migratory birds.
The correct sequence, from top to bottom, is
