Skeletal muscles
A) are found in and around internal organs.
B) get longer when they contract.
C) work in antagonistic pairs.
D) push on bones to make them move.
Answer: C
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The belief that humans arose in sub-Saharan Africa and then moved out is which model of evolution?
a. classic b. retroactive c. multiregional d. migratory
What is most closely associated with membrane-attack complexes (MACs)?
a. complement proteins b. helper T cells c. B cells d. histamines e. cytokines
Which statement about the development of a coelom is FALSE?
a. It requires animals to have either two or three tissue layers. b. It requires the endoderm to be covered by mesoderm. c. It occurs in protostomes and deuterostomes. d. It may occur by random. e. It is a fluid-filled cavity.
____ in the figure diagram above represent consumers.
A. Only the plants
B. Only the insects
C. Everything except trees
D. Spiders, frogs, fish, and humans