Gustation and olfaction rely on each other to give complete perceptions of taste and smell.

True

Gustation give a taste perception and olfactory is an insight of smell. In gustation, only four tastes were recognized, namely sweet, salty, sour, and bitter. However, research of the 20th century led to recognition of the fifth taste, umami that means delicious taste or savory. 

Meanwhile, olfaction or the sense of smell is a responsive stimulus that contains bipolar sensory neurons that are located in a small region within the superior nasal cavity.

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.