Progesterone stimulates uterine contractions.

A. Aerobic respiration; anaerobic fermentation: Aerobic respiration primarily occurs in the mitochondrion, and anaerobic fermentation occurs in the cytoplasm. Therefore, this is incorrect.

B. Glycolysis; the citric acid (Krebs) cycle: Glycolysis occurs in the cytoplasm, breaking down glucose into pyruvate. The citric acid (Krebs) cycle takes place in the mitochondrion, where it further processes pyruvate for energy production.

C. The citric acid (Krebs) cycle; mitochondrial electron-transport: Both the citric acid cycle and the mitochondrial electron transport chain occur in the mitochondrion.

D. Anaerobic fermentation; glycolysis: Glycolysis occurs in the cytoplasm and is the first step in both aerobic and anaerobic pathways, but anaerobic fermentation also occurs in the cytoplasm, so this option is not accurate in distinguishing between processes happening in different locations.

A. Uterine tube: Fertilization typically occurs in the uterine tube (also known as the fallopian tube). The sperm travels from the cervix through the uterus and into the uterine tube, where it meets and fertilizes the egg.

B. Uterus: The uterus is where the fertilized egg implants and develops into a fetus, but it is not where fertilization occurs.

C. Ovary: The ovary is where eggs are produced and released during ovulation, but fertilization does not occur here.

D. Urinary bladder: The urinary bladder is part of the urinary system, not the reproductive system, and has no role in fertilization.