A new moon is visible on Earth when the Sun, Moon and Earth are positioned so that the Moon - a is on the opposite side of Earth from the Sun. b is in between Earth and the Sun. c forms a right angle with Earth and the Sun. d can’t be seen from Earth or the Sun.

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

it's c.us forest service