Iron is a critical nutrient, but less can be better than more. Outline two "experiments" chronicled in this chapter (one was an actual experiment) that demonstrate this fact. State 3 variables you would control in order for their results to be valid.

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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condenser is used to focus in the light microscope.

answerpotassium hydroxide preparation;

treatment of fungal infections usually follows diagnosis confirmed by potassium hydroxide preparation or culture;