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5.  glycolysis, the tricarboxylic acid cycle, and oxidative phosphorylation

6.  If oxygen is not present, some organisms can undergo fermentation to continually produce ATP. Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen.

7. Glycolysis is the process in which one glucose molecule is broken down to form two molecules of pyruvic acid

Explanation:

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.

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