3. scientists tried to use balloons to\n○ transport weapons.\n○ signal to planes.\n○ track wild animals.\n○…

3. scientists tried to use balloons to\n○ transport weapons.\n○ signal to planes.\n○ track wild animals.\n○ carry sound sensors.

3. scientists tried to use balloons to\n○ transport weapons.\n○ signal to planes.\n○ track wild animals.\n○ carry sound sensors.

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