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