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- Cockroaches have carried a symbiotic relationship for millions of years with special bacteria called Bacteroides.
- A large number of people can be occupied in apartment buildings.
- A tree is equivalent to 2 central air conditioners as it cools and regulates the temperature.
- Infants who use more hand gestures at 18 months old will have great language abilities in the future.
- Fingernails protect the fingertips and also the surrounding soft tissue from any external injuries.
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