How might secondary contact result in a cline?
a. Reproductive character displacement completes the speciation process.
b. Hybrid matings may have low fitness.
c. Reproductive isolation is partially complete and a spatial gradient of hybrids forms.
d. Reproductive isolation is incomplete and the two populations form a single species without spatial variation.
C
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Given this information from one element in the periodic table of elements, the number of neutrons and protons is
A. 7, which is also the atomic mass.
B. unable to be determined with the information provided.
C. 14, which is also the atomic mass.
D. 14, which is also the atomic number.
E. 7, which is also the atomic number.
Amphibians appeared on land about:a
543 million years ago. b. 450 million years ago. c. 420 million years ago. d. 250 million years ago. e. 65 million years ago.
Which one of the following diseases is caused by a virus?
A) rabies B) Lyme disease C) syphilis D) toxic shock syndrome E) tuberculosis
Exotoxins differ from endotoxins in that exotoxins
A) are composed of lipopolysaccharides. B) are stable at 60°C. C) cannot be converted to toxoids. D) are secreted from living cells.