A male and female mouse are mated. The graph below illustrates serum progesterone levels in the female (mating occurs on day zero). 200 180 160 E 140 120 100 80 60 40 20 0 1 2 3 0 1 2 3 4 5 6 7 8 9 10 days post ovulation State the physiological response indicated by the line from day 0-8. serum P4 (ng/ml)

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