A person able to hear only high-frequency sounds would probably have which of the following structural problems in the ear?
A) The tympanum is damaged because of chronic ear infections.
B) The basilar membrane is stiffened along its entire length.
C) The ear ossicles are abnormally thickened.
D) All of these problems could result in inability to detect low-frequency sound.
Answer: B
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a. lungs b. intestines c. heart d. liver e. reproductive system
Which one of the kingdoms include producers, composers, and consumers?
a. Animalia b. Archae c. Protista d. Plantae e. Fungi
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Some local populations, and occasionally entire species, have reduced genetic diversity because their populations were severely reduced in the past. This is called a
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