10 points
which of the following is true of scientific investigations?
a. scientific explanations are not rigorously tested
b. information is obtained through observations and experimentation
c. information is obtained only through experimentation
d. pseudoscientific explanations are not automatically rejected

B. Information is obtained through observations and experimentation.

Explanation:

In a scientific investigation, you will always have to observe and experiment on a project. If you only do the experiment and tell people what happened in the experiment, but they don't believe you is because you didn't observe and write down your results.

B. Information is obtained through observations and experimentation.

That is your answer.

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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.