What triggers the decline in estrogen and progesterone levels at the end of the menstrual cycle?

a. menstruation
b. breakdown of the corpus luteum
c. decreasing LH levels
d. increasing GnRH secretions
e. shedding of the uterine lining


ANSWER: b

Biology & Microbiology

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Plants that show a pattern of stomatal opening and closing that is the reverse of C3 plants are called  

A.  C4. B.  Temperate. C.  CAM. D.  Calvin cycle.

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The dotted areas in the figure below indicate where

__________ reactions will occur to produce __________ and __________. a. condensation; covalent bonds; hydroxyl ions b. electron transfer; covalent bonds; water molecules c. condensation; covalent bonds; water molecules d. cleavage; covalent bonds; hydrogen ions e. condensation; ionic bonds; hydrogen ions

Biology & Microbiology

Labeling.The following statements refer to the figure below showing the general body plan of a plant. ? Figure 27.2 The plant parts ABOVE the line at "C" represent the __________.

A. ground tissue only B. root system C. shoot system D. stalk E. light-independent parts

Biology & Microbiology

The true pathogen (Salmonella/Shigella/Yersinia) is a non-coliform, non-motile, oxidase-negative member of the Enterobacteriaceae that does not produce hydrogen sulfide.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology