Air is. A. Element
B. Composite
C. Homogeneous mixtures
D. Heterogeneous mixtures

C- homogeneous mixture

Explanation:

its made up of multiple elements that aren't chemically combined.

you cannot see the parts of the mixture

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.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this