Which of the following trends in evolution of the nervous system refers to the formation of a distinct head that has a large concentration of neurons?
A. Cephalization
B. Ganglion
C. Brain
D. Peripheral nervous system
E. Central nervous system
Answer: A
Biology & Microbiology
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True or false: All introns have identical lengths and sequences
A. true B. false
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Speciation requires that two populations become ____ from each other
Fill in the blank with the appropriate word.
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Life apparently originated on Earth about
A. 1 million years ago. B. 6000 years ago. C. 4.5 billion years ago. D. 8 billion years ago. E. 3.5 billion years ago.
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Rainforests, old growth forests, and coral reefs are examples of biological __________
Fill in the blank(s) with the appropriate word(s).
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