Thirteen-year-old grace's blood tests indicate that her levels of testosterone are about twice as high as they were a year ago, and that her estradiol levels are about eight times higher than last year's. grace is most likely experiencing: a. normal changes as a result of having entered puberty. b. difficulties because of significant imbalances in hormonal levels. c. abnormal levels of development of male physical characteristics. d. abnormal levels of development of female physical characteristics