Aperson with 20/40 visual acuitya) must be twice as close to an object to see it as a person with 20/20 visionb) must be twice as far away away from an object to see it clearly as a person with 20/20 vision

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.