Which of the following BEST explains why the natural family planning method should be used by long-term couples only? A.
This method is the least effective method of all birth controls.
B.
This method requires the couple to be prepared for a child.
C.
This method protects against numerous STIs.
D.
This method is 100% effective if done correctly.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .

the suction machine and tubing is the equipment that should be left behind and should be most easily accessible.