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