They can constrict or dilate because their walls are muscular.
Well... It wouldn't be effective as it is a synthetic progestin meant to cause menstrual bleeding and ovulation... The thing is that because that would take four more weeks to happen again, so it would be ineffective.
The mini pill which is essentially the same thing and is Progestin is to be taken everyday and has a 90 effectivity rate.
Answer:
Epidemiology is the branch of medicine which deals with the incidence, distribution, and possible control of diseases and other factors relating to health.
Explanation:
I hope this helps
How do you not know this it’s so easy
