Which of the following is an example of a solution? a. flour and water b. sand and water c. salt and water

A solution occurs when the solute and the solvent are distributed evenly, on a consistent ratio. Flour and sand, do not distribute evenly in water, leaving salt as the only possible option.

The image below shows how water and salt form a solution.

Hope it helped,

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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.