The soft core is called medulla
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.
Answer:
Pectoralis Major
it covers the chest... I hope this helps
It could be that Kima has more muscle which could lead to her weighing more than her sister