1. Observation in the natural scene: Observation in the natural scene takes the typical change process in nature as the object, selects specific events or phenomena for observation, or collects plant or animal samples for observation.
2. Observation under natural conditions: Observation under natural conditions refers to natural things or phenomena that can be touched by sensory observation, such as observing the behavior of animals and the appearance of plants.
3. Laboratory observation: Laboratory observation is conducted under artificially controlled conditions, such as observing the cell structure with a microscope.
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