Dr. Easton is researching prenatal influences on gender in a longitudinal study. She is collecting blood samples from fetuses and will follow gender role development through age eighteen. One substance in the blood that is of particular interest to Dr. Easton, based on prior research linking it to gender-related play behavior, is.

Explanation:

Dr. Easton is researching prenatal influences on gender in a longitudinal study. She is collecting blood samples from fetuses and will follow gender role development through age eighteen. One substance in the blood that is of particular interest to Dr. Easton, based on prior research linking it to gender-related play behavior, is testosterone.

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