How is good (stratospheric) ozone formed?
answer is b

Explanation:

it is formed naturally through chemical reactions using solar ultraviolet radiation and oxygen molecules

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.

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.