When news of a scientific discovery is reported, readers must assess the credibility of the claim. for scientific discoveries in general, which statement indicates a valid and credible claim? a. the scientist aimed for precision and accuracy by using a small sample size. b. the scientist followed strict standards of investigation and scientific methodology throughout the research. c. the scientist assured that the experiment was broad in scope by testing many variables in each trial. d. no other scientists replicated the experiment to avoid the legal issues of patent infringement.

The correct answer is B. The scientist followed strict standards of investigation and scientific methodology throughout the research.

It is important to follow the standard of investigation in order to answer the question as well as possible.  Scientific method include a few steps that help scienties focus on your scientific question and work through observations and avaliable data.

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.