Which of the following statements is true? friction works in the direction opposite of motion. lubrication can be used to increase friction. only large masses exert gravitational force. air resistance is greatest for objects with small surface areas.

answer; the correct answer is conflict- related aggression; +

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 : )