Likely the chronological age, mainly because it would explain the differences in puberty stages between the two boys, which is an example of physical maturation.
1. Vaccines
2. Safer and healthier foods
3. Control of infectious diseases
4. Safer workplaces
5. Mental illness
6. Improving healthcare delivery
7. Premature mortality
8. Diabetes
9. Obesity
10. Aging population
11. Disability
12. Unintended pregnancies
13. Use of tobacco or other drugs
14. Cancer
15. Multimorbidity
Answer:
D.cardio-respiratory endurance
Explanation:
Hunting and walking because your not really doing a physical activity
