Approximately how long ago did the first distinctly human ancestor appear?

A) 10,000 years ago
B) 100,000 years ago
C) 5 million years ago
D) 10 million years ago
E) 3 billion years ago

C

Biology & Microbiology

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The bulk of a plant is composed of:

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Which of the following is not common to all vertebrates?

a. a forebrain b. a hindbrain c. a convoluted cerebrum d. a dorsal tubular spinal cord e. a midbrain

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Immediately outside the pulp cavity of a tooth is the:a

enamel. b. dentin. c. cementum. d. spongy bone. e. nerve.

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Each of the following viruses or diseases are transmitted via the oral-fecal route, except

A. rotavirus. B. norovirus. C. poliovirus. D. hepatitis C virus. E. hepatitis A virus.

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