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In Spring, Lisa notices there is an equal amount of long and short stemmed buttercups in the vacant lot across the street from her house as well as in his own backyard.

In Spring, Lisa notices there is an equal amount of long and short

stemmed buttercups in the vacant lot across the street from her house as well as in his own backyard. In late summer she notices that there are mostly long stemmed buttercups in the lot but mostly short stemmed buttercups in her yard. These observations are examples of what biological principle. Develop a hypothesis to explain Lisas observations.

 
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