题目内容
It is easier to study animals and plants than human beings _____________ plant and animal behaviors can be controlled and monitored.
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_____________ computers, ecologists have simulated communities containing various plants and animals.
_____________ children get older, their questions get harder to answer.
Ecologists try to find out how the Earth's environments can be preserved _____________ living things will continue to survive on the planet.
_____________ laws for protection, many of the desert aquatic habitats and their associated species are still in danger.
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