Which of the following is true or accurate about malaria?
a. The organism that causes malaria is a virus related to H5N1.
b. Mosquito saliva transmits tiny sporozooites to the victim when they are bitten.
c. Malaria can be transmitted to humans by contact with pig or bird feces.
d. Malaria is the greatest health threat to northern Eurasia and North America.
Answer: b. Mosquito saliva transmits tiny sporozooites to the victim when they are bitten.
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A kg of 40°C water and a kg of 20°C water, after being mixed, have a temperature of 30°C. But the final temperature of a 1-kg iron block at 40°C placed into 1 kg of water at 20°C is
A. less than 30°C. B. more than 30°C. C. at or about 30°C. D. none of the above
Cyclonic storms can form within or between air masses (a large body of air with a uniform density throughout)
Indicate whether the statement is true or false
The fossil ferns in this photograph probably indicate that the rock was deposited
A. on land. B. in the deep ocean. C. by the wind. D. in the shallow ocean.
A looping shape exhibited by a smokestack plume is indicative of ____ conditions
a. inversion b. stable c. neutral d. unstable e. both inversion and stable