Auntie Penuela has blood group B and has a daughter of blood O .she says a certain man called Caleb is the child's father .when tested his blood was found to be AB . could he be the child's father . explain your answer fully

it would lead to upper respiratory infections and pneumonia.

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.