The trophoblast secretes ____, which signals the corpus luteum that pregnancy has begun
a. estrogen
b. a gray crescent
c. progesterone
d. hCG
e. an enzyme
d
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Goiter is a disease characterized by an enlarged thyroid gland. Which of the following either leads to or is an outcome of the disease?
A. iodine deficiency in the diet B. reduced levels of T3 in the blood C. reduced levels of T4 in the blood D. excessive thyroid-stimulating hormone production E. All of the choices are correct.
Human pathogens of the genus Encephalitozoon belong to the ________.
A. Microsporidia B. Chytridiomycota C. Urediniomycetes D. Glomeromycota
What is meant by the term "cephalization"? Identify at least 4 animal phyla that possess this feature
What will be an ideal response?
The selective movement of specific small molecules and ions into excretory system tubules is
a. reabsorption. b. release. c. filtration. d. secretion. e. diffusion.