In ____ to understand climate change, we need to first understand greenhouse gases. Frogs are amphibians. In ____ words, they live on land and in the water. Plants rely on photosynthesis. To put it ____ way, they will die without the sun. Whales are mammals. That is to ____, they must breath air. Zoologists have long sought to understand how animals communicate with each other. To that ____, a new study has been launched that look at elephant sounds and their possible meanings.

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