The correct option for the question given is (C) Talia puts in only 50 percent of effort during her workout.
Internal barrier differs from external barrier to working out in that the former comes from the individual, while the latter is more influenced by the environment, availability of exercise equipments, other people, and other external factors. The other options for the question all falls into the category for external barriers.
Medications (SSRIS)
Therapy
and good friends
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Secondary sex features are characteristics that develop during puberty. Using the process of elimination, options B and D are really primary gender characteristics. Also, option A has more to do with your genetics than your gender.
That leaves option C. Breasts. They are a secondary sex characteristic that develops during puberty.
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Special Supplemental nutrition program for woman, infants and children
