Salmon eggs hatch in freshwater. The fish then migrate to the ocean (a hypertonic solution) and, after several years of feeding and growing, return to freshwater to breed
How can these organisms make the transition from freshwater to ocean water and back to freshwater? A) The rectal gland functions in the ocean water, and chloride cells function in freshwater.
B) Different gill cells are involved in osmoregulation in freshwater than in salt water.
C) Salmon in freshwater excrete dilute urine, and salmon in salt water secrete concentrated urine.
D) Their metabolism changes in salt water to degrade electrolytes.
B
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If the number of chromosomes in an animal's gametes is 20, then a somatic cell from that animal would contain ____
chromosomes.
a. 5 b. 10 c. 20 d. 40 e. 80
Four of the five choices listed below are threats to
species survival. Select the exception. a. habitat loss b. introduction of exotic species c. overharvesting d. illegal wildlife trading e. strip logging
Where are you most likely to find archaea?
hot springs a local stream soil in your backyard the scum of an aquarium
Gonococcal infections result in lifelong immunity against Neisseria gonorrhoeae.
Answer the following statement true (T) or false (F)