Which statement best explains why the overall charge on an atom is zero? the positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud. the positive charge of the protons in the nucleus equals the negative charge in the electron cloud. the negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud. the negative charge of the protons in the nucleus equals the positive charge in the electron clou

B) The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

(I just took the test and it was right). :)

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.

a. to encourage apoptosis