Labs, perform work with indigenous or exotic agents that may cause serious or potentially lethal diseases through the inhalation exposure.

BioSafety Level (BSL) 3 labs, perform work with indigenous or exotic agents that may cause serious or potentially lethal diseases through the inhalation exposure. Biological Safety Levels (BSL) are a sets of protections assigned to the activities that occur in specific biological laboratories. BSL protects laboratory workers, the surrounding environment and also the community.

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.

thats not even an aswer choice