What cause of infertility happens to nearly every woman at some point?  

A.  idiopathic infertility
B.  pelvic inflammatory disease (PID)
C.  endometriosis
D.  luteal phase defect
E.  aging


E.  aging

The most common cause of infertility is the eventual failure of ovulation and reproductive cycling around the time of menopause.

Biology & Microbiology

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American sycamore(Platanus occidentalis) and European sycamore (Platanus orientalis) are tree species that will interbreed if planted nearby but will not normally interbreed because they occur on different continents. This is an example of

A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.

Biology & Microbiology

A sharp reduction in the incidence of Haemophilus influenzae serotype b infections is principally due to

A. the elimination of the natural reservoir of H. influenzae. B. the development of an effective vaccine. C. improvements in sanitary conditions in meat processing plants. D. the discovery of new antibiotics.

Biology & Microbiology

Ethylene stimulates the ripening of fruits

____________________ Indicate whether the statement is true or false.

Biology & Microbiology

Members of which of the following phyla would exhibit ostia and an osculum?

a) Cnidaria b) Cnetophora c) Nematoda d) Rotifera e) Porifera

Biology & Microbiology