Four of the five time periods listed below represent
milestones in the evolution of life on Earth. Select
the exception.
a. 12 to 15 billion years ago
b. 3.2 billion years ago
c. 2.1 billion years ago
d. 570 million years ago
e. 200 million years ago
Answer: a
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Which of the following are NOT important in chemical synapses?
A. gap junctions B. neurotransmitters C. specific neurotransmitter receptors D. secretory vesicles E. voltage-gated Ca2+ channels
Normal cell functions of noneukaryotes are disrupted by
A. enzymes. B. mitochondria. C. antibacterial antibiotics. D. cell walls.
Unlike the five kingdom system of classification, the six kingdom breaks ___ into two groups
Fill in the blank(s) with the appropriate word(s).
Which of the following is not a factor contributing to the loss of biodiversity?
A. overexploitation B. disease C. pollution D. alien species E. increased carrying capacity