List three ways that bacteria in your digestive system are to you?

Some bacteria help you to digest food .

Some bacteria prevent harmful bacteria from attaching to your intestines and making you feel ill.

Some bacteria make vitamins that your body needs.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

the answer to your question is tooth decay.