Select all parts of the human central nervous system.
A. vertebrae
B. spinal cord
C. brain
D. nerves
E. ganglia
Answer: B & C.
B. spinal cord
C. brain
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A. Formation of greenhouse gases, CO2 and methane B. Thermal hot springs warmed by heat from earth's interior C. Decomposition of dead matter and wastes D. Digestion of complex carbohydrates in animal diets
What was the likely fate of the first life on
earth?
a. destroyed by a meteorite b. outcompeted by multi-celled organisms c. consumed by dinosaurs d. poisoned by oxygen gas e. starvation
What is the name of the second cervical vertebra?
What will be an ideal response?
Humans cannot survive long at altitudes greater than 6000 m because ________.
A. the partial pressure of O2 becomes less than half that at sea level B. the diaphragm cannot be contracted enough to produce a full breath C. alveoli become compressed at the lower atmospheric pressures D. there is much more CO2 in the atmosphere at the higher altitudes than at sea level