A patient at a fertility clinic has been diagnosed with "luteal phase defect" (LPD). Her progesterone levels are low and her cycles are short. What step of reproduction are these symptoms disrupting?

A. Follicle development
B. Fertilization of the egg
C. Implantation
D. Ovulation


Answer: C

Biology & Microbiology

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________ occurs as a result of cartilage wearing down over the course of a lifetime

a. Sprains b. Dislocations c. Rheumatoid arthritis d. Strains e. Osteoarthritis

Biology & Microbiology

The classic work of Friedrich Wöhler (1828) that united the fields of biology and chemistry was based on the

A) discovery of yeast ferments. B) production of urea in the laboratory. C) discovery of ATP. D) identification of nucleotide bases. E) analysis of gene segregation.

Biology & Microbiology

Although the same cell types can be found in both primary and secondary phloem, which type of cell

is usually more abundant in secondary phloem? a. parenchyma b. fibers c. vessel elements d. companion cells e. sieve tube members

Biology & Microbiology

Changes to the __________ gave tetrapods improved detection of airborne sounds, while evolution of __________ prevented delicate eye tissues from drying out.

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

Biology & Microbiology