An Extremely Rare Occurrence in Humans Is a Multiple Pregnancy

question 35

Multiple Choice

An extremely rare occurrence in humans is a multiple pregnancy with the embryos at different stages due to fertilization weeks apart.What mechanism normally prevents this from happening?

• A)The embryo's secretion of FSH and LH maintains the corpus luteum,keeping estradiol and progesterone high until the placenta takes over secretion of these hormones.
• B)The embryo's secretion of GnRH maintains the corpus luteum,keeping FSH and LH high until the placenta takes over secretion of these hormones.
• C)The embryo's secretion of hCG maintains the corpus luteum,keeping estradiol and progesterone high until the placenta takes over secretion of these hormones.
• D)The follicle's secretion of polar bodies maintains the fimbriae,keeping estradiol and progesterone high until the fallopian tube takes over secretion of these hormones.

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Definitions:

Economies of Scale

Cost advantages that enterprises obtain due to their scale of operation, leading to cost per unit of output decrease with increasing scale.

Average Fixed Costs

The constant expenses in production, which remain unchanged regardless of output levels, when divided by the volume of output created.

U-shaped

A description often used in economics to describe the graphical representation of a situation where certain costs initially decrease, reach a minimum, and then start to increase as output expands.

TVC

Total Variable Cost; the entire cost associated with producing a given output level that varies with the quantity of output.