The main factors affecting birth are:
Age.
Health.
Heredity.
Ovulation cycle.
Location.
Miscarriage
Sedentary is the answer I think hope this helps :D
Book is suggesting a diet while the other is suggesting the type of diet I think they both help each other out (sorry if I’m wrong)
There are still some cases of polio in the united states because there is a large amount of people in the united states who aren’t vaccinated
