Nonpoint source comes from a variety of locations and is easy to trace

This is FALSE because they are set in verity of places no pattern. like a scatter plot.

in a word, a scientific question is testable. a testable question is one that asks about objects, organisms or events found in the world around it

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 : )