Lipids differ from other large biological molecules in that they

Have a nonpolar nature

Explanation:

Organic molecules are composed of carbon and hydrogen, they're divided into four major classes: proteins, nucleic acids, carbohydrates, and lipids. Lipids are divided into two categories:

Both kinds of lipids share an important behavior, they don't readily dissolve in water, but they are soluble in many organic solvents. This is related to their polarity, the electrons in lipids are distributed unevenly creating a molecule that can have a partial positive charge and another part with a partial negative charge.

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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.