Part of the quadriceps group of muscles
a. rectus femoris
b. rectus abdominis

A. Rectus femoris

Explanation:

Rectus femoris is one of the muscles of the Quadriceps femoris group which in turn makes the anterior and posterior thigh. The rectus femoris,  vastus intermedius, vastus medialis, and vastus lateralis together make the quads. Rectus femoris is the thigh muscle that originates from the ilium. It is an example of bipennate muscle and has central tendons. Fascicles are located on either side of the tendons.

blue stars have the highest surface temp

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the measure of a star's brightness is called magnitude

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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.