Which of the following is not a key ingredient in cloud formation? particles. drizzle. water vaper. drop in air pressure

Drizzle

Explanation:

Clouds require water vapor, particles the vapor can condense around, and a drop in air pressure to form.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

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.