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