The number of genes that affect skin, hair, and eye color is
A) less than 4.
B) less than 8.
C) more than 20,000.
D) more than 100.
D) more than 100.
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Which one of the following is considered to be an important plant hormone that helps plants cope with environmental stresses?
A. auxins B. prostaglandins C. ethylene D. abscisic acid E. oxaloaecetic acid
Four of these five choices are substances that release ozone-destroying chemicals. Select the exception
a. evaporating fossil fuels b. coolants c. solvents d. plastic foam e. propellants in aerosol cans
Dogs and pigs are members of different species because
A. one is a predator, and the other is prey. B. hybrids between them are infertile. C. they are at the far end of the ring in a ring species. D. of prezygotic barriers to their ability to breed. E. of postzygotic barriers to their ability to breed.
Assume that two organisms belong to the same class. Which other classification group do these two organisms have in common?
A) order B) family C) genus D) phylum