Over the past two centuries, how has the growth of human population changed?
A) It has leveled off slowly.
B) It has increased steadily.
C) It has exhibited "boom and bust" growth.
D) It has increased exponentially.
D
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Freshwater fish reside in hypotonic environments. They do not drink water, and they excrete large volumes of hypotonic urine in an effort to osmoregulate. How do they obtain an adequate supply of electrolytes?
A) The rectal gland is specialized to produce the dilute (hypotonic) urine and conserve ions. B) Chloride cells transport additional electrolytes into the circulation of these organisms. C) Gill filaments take up additional electrolytes from freshwater. D) There is an increase in Na+/K+-ATPase activity across the basolateral membrane.
Air enters the lungs when the diaphragm ________.
A. contracts B. relaxes
After ovulation, the ovum remains fertile for about:a
1 hour. b. 6 hours. c. 24 hours. d. 2 days. e. 3 days.
You step on something in the yard resulting in a puncture wound that does not bleed freely. Antigens from any microbes that entered the wound will most likely end up in the
A. appendix. B. lymph nodes of the groin. C. lymph nodes of the neck (cervical). D. lymph nodes of the armpit (axilla). E. spleen.