PLEASE HELP! 30 POINTS!

Question :
The cross section below shows the movement of wind-driven sand particles that strike a partly exposed basalt cobbler located at the surface of a windy desert. Hint: If wind is constantly hitting the left hand side of this cobble, how will the left hand side of the cobble look over time?

B

Explanation:

i think its B im not sure if you want trust me like i said im not sure

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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.