_____________ children get older, their questions get harder to answer.
As
Because of
C. However
D. In case
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Ecologists try to find out how the Earth's environments can be preserved _____________ living things will continue to survive on the planet.
A. thanks to
B. now that
C. in order to
D. so that
_____________ laws for protection, many of the desert aquatic habitats and their associated species are still in danger.
A. Even though
Because
C. Despite
D. No matter
Experts estimate that we are losing 137 plant, animal and insect species every single day _____________rainforest deforestation.
A. as
B. while
C. as a result
D. due to
__________ fuel prices increased, __________did the demand for smaller, fuel-efficient cars.
As / so
B. As / nor
C. So / so
D. Whether / or