A carbon atom with six protons, seven neutrons, and six electrons has a mass number of
a. 6.
b. 7.
c. 12.
d. 13.
e. 19.
D
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The typical carbon atom is described in the periodic table by the accompanying box. How many protons are in a typical oxygen atom?
A. 12 B. 8 C. 18 D. Not enough information given
Many closely related duck species exhibit ____, the dramatic variation in the appearance of males but not females,
which is an almost certain sign of ____.
a. asexual reproduction; sexual selection b. asexual reproduction; artificial selection c. sexual dimorphism; sexual selection d. sexual dimorphism; artificial selection e. sexual uniformitarianism; sexual selection
Which of the following can be used by humans as an energy source?
a. chitin b. amino acids c. cellulose d. RNA
Bones are held together at joints by
a. tendons. b. intercellular junctions. c. ligaments. d. cartilage. e. collagen.