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

Biology & Microbiology

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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.

Biology & Microbiology

Human pathogens of the genus Encephalitozoon belong to the ________.

A. Microsporidia B. Chytridiomycota C. Urediniomycetes D. Glomeromycota

Biology & Microbiology

What is meant by the term "cephalization"? Identify at least 4 animal phyla that possess this feature

What will be an ideal response?

Biology & Microbiology

The selective movement of specific small molecules and ions into excretory system tubules is

a. reabsorption. b. release. c. filtration. d. secretion. e. diffusion.

Biology & Microbiology