There are 20 amino acids that make up all proteins in all living things, 12 of those we can make, that other 8 are said to be

There are 20 amino acids that make up all proteins in all living things, 12 of those we can make, that other 8 are said to be essential amino acids.

Explanation:

Essential amino acids are those amino acid which is not prepared in the body of living organisms. There are nine essential amino acids i. e. valine, phenylalanine, threonine, histidine, isoleucine, leucine, lysine, tryptophan and methionine. These amino acids are used for building of important substances such as enzymes etc that are necessary for normal growth of body.

"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."