What difficulties are encountered in studying living cells of multicellular organisms?

The difficulties encountered in studying living cells of multicellular organism is that they are difficult to be tackled on as they are compose of cell that is more than one, making it hard for them to be studied and to be identified with different organisms composing multicellular or has more than one cell.

"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."