Fertility is impaired when a male’s sperm count drops below _____ sperm per milliliter of semen, and
he is considered sterile if his sperm count drops below _______ sperm per milliliter of semen..
a. 500 million; 200 million
b. 100 million; 50 million
c. 35 million; 20 million
d. 2 million; 1 million
e. 500,000; 100,000
C
You might also like to view...
Larval development of helminths occurs in which host?
A. Larval development takes place in all hosts. B. Definitive host C. Primary host D. Transport host E. Intermediate host
. Former president Ronald Reagan once commented at a press conference that the best way to combat the spread of AIDS in the US was to prohibit everyone from having sexual contact for 5 years
What would be the success of such a program if it were possible to carry out? A. It would 'cure' the population of HIV/AIDS. Everyone that had it would die off, and no new cases would occur, since sexual contact is the only mode of transmission for this virus. B. It would be a failure-this 'program' wouldn't eliminate IV drug use or transmission of HIV from mother to child. Sexual transmission isn't the ONLY mode of transmission for this virus. C. It would be a failure-many HIV positive individuals survive for longer than 5 years, even without treatment (sometimes without even realizing they're positive). Once sexual contact resumed, sexual transmission would also resume. D. It would be a failure-this 'program' wouldn't eliminate IV drug use or transmission of HIV from mother to child. Sexual transmission isn't the ONLY mode of transmission for this virus, AND many HIV positive individuals survive for longer than 5 years, even without treatment (sometimes without even realizing they're positive). Once sexual contact resumed, sexual transmission would also resume.
Ferns, horsetails, and club mosses are _____
a. seed-bearing vascular plants b. gymnosperms c. angiosperms d. seedless vascular plants e. nonvascular plants
Blood pumped from the left ventricle goes into the ____
a. vena cava b. aorta c. pulmonary artery d. right ventricle e. left atrium