The first Europeans to travel to the Amazon region ------------ seeing widespread settlements.
announced
reported
notified
informed
Wrens didn't flee from unfamiliar sounds. But after training, they usually---------- so.
did
This is a useful skill, given ----- hard it can be to see predators.
how
Birds listen to the alarm calls of other species ,---------- it possible for them to take advantage.
making
These accounts were subsequently --------------- as fantasies.
Dismissed
Dispelled
Denied
Declined
Researchers --------- satellite images and identified 81 ancient sites.
scoured
peered
sought
probed
It is believed European diseases arrived in the area ,even before Europeans ever ------- foot in the area.
put
stepped
left
set
The sites ---------- from single hamlets to large villages.
lined
ranged
covered
graded
The discoveries have added ---------- to the idea the population of the Amazon were much greater than once thought.
size
charge
force
weight
Deforestation has helped reveal evidence, mainly in the ---------- of earthworks.
Model
Feature
Pattern
Form
----- the absence of predators, birds can be trained to call for help.
In
There are many eyes looking out ------- danger.
for
In one recent study in a ---------- remote region of the Amazon,....
roughly
virtually
practically
relatively
People are encouraged to ------- goals and then strive to achieve them.
set
fit
mark
lay
Such a narrow focus can ------ to problems.
trigger
lead
cause
result
Birds can learn unfamiliar calls,----------- the bird that made that call even being visible.
without
Birds learn life skills in various ways. .....some of what they know is innate, some is acquired.
While
An obsession with achieving goals is a common--------- of life in many parts of the world.
feature
point
character
matter
The research team also came --------- fragments of ceramics.
over
about
through
across
Individual birds learn from each other --------- than through direct experience.
Rather