Plan an Investigation Design a controlled experiment to test the effect of water
temperature on goldfish. Be sure to include your hypothesis, independent variable, and
dependent variable, as well as the experimental and control groups in your experiment.

answer: oceans, duh

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 : )