The first Europeans to travel to the Amazon region ------------ seeing widespread settlements.
announced
informed
notified
reported
These accounts were subsequently --------------- as fantasies.
Dispelled
Dismissed
Denied
Declined
Deforestation has helped reveal evidence, mainly in the ---------- of earthworks.
Pattern
Model
Feature
Form
In one recent study in a ---------- remote region of the Amazon,....
practically
relatively
roughly
virtually
Researchers --------- satellite images and identified 81 ancient sites.
scoured
peered
sought
probed
The sites ---------- from single hamlets to large villages.
graded
ranged
lined
covered
The research team also came --------- fragments of ceramics.
about
through
over
across
The discoveries have added ---------- to the idea the population of the Amazon were much greater than once thought.
size
force
weight
charge
It is believed European diseases arrived in the area ,even before Europeans ever ------- foot in the area.
set
stepped
left
put
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
