What mixture of seed was harvested in the plot that was planted with 25 percent species x and 75 percent species y ?

50% and 50%

Explanation:

The graph shows that when the mixture of seeds planted contained 25% species X (and therefore 75% species Y, to make 100%), 50% of the seeds harvested were species X. If 50% of the seeds harvested were species X, the other 50% of the seeds harvested must have been species Y.

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