A dog, Skipper, is roaming around the neighborhood. Skipper passes one of his favorite spots and lifts his leg to urinate on a fire hydrant. Three
systems at work are:

5. Muscular

6. Skeletal

12.Excretory

Explanation:

He lifts his leg, meaning his using skeletal and he is removing waste from his body using muscular & excretory.

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The answer would be A - The animals gain nutrient-rich foods, and the angiosperms’ egg cells are fertilized.
{explanation: for it to be a mutualistic relationship both organisms would “work together”, each benefiting from the relationship; therefore, it’d be A.}