Binding of an rna binding protein will the stability of the rna molecule.
increase
decrease
neither increase nor decrease
either increase or decrease

either increase or decrease

Explanation:

There is not only one type of RBP (RNA-binding protein). There are many subfamilies of this kind of proteins that can play a role in RNA stability. Many of them take a role in post transductional modification process, like splicing or degradation.

the answer to your question is sperm

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.