Respuesta :
Answer:
1.C. Jackie may maintain healthy body fat levels.
2.A. Digital timer
3.A. Family history
Explanation:
The daily activities that Jackie is performing as well as the time that she spents doing exercise can help regulate her body fat levels, and help her mantain them in a healthy place for her, a digital timer can help Jenna use technology to asses her speed, and a risk that is not controlable and that may affect physical activity throughout a persons life would be family history, since the person can not control her dna inheritance.