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Some animals and plants depend on each other for existence. Some animals and plants develop their relationship easily. Some plants depend on each other for food. Some animals live better together.
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takes place only during a particular season occurs only during the night is a daily practice only happens when a species becomes over-populated
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a; the a; / the; a / ; the
a sleep to avoid eating a temperature in a cold weather a sleep in the cold season an animal to practice sleep in winter
a; the a; 不填 the;a 不填；the
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