Endocytosis and exocytosis are forms of active transport What is active transport? O the movement of molecules up a concentration gradient from low to high, using energy
O the movement of molecules down a concentration gradient from high to low, using energy
O the movement of molecules up a concentration gradient from low to high, using no energy
o the movement of molecules down a concentration gradient from high to low, using no energy​

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explanation:

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explanation:

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"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."