Humans are protected from air pollution by
a. sneezing and coughing
b. mucus capturing small particles
c. nasal hairs filtering out large particles
d. tiny mucus-coated, hairlike structures called cilia
e. all of these answers
E
Environmental & Atmospheric Sciences
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Cost distance measure operations are based on the node-link cell representation. Explain this representation with a diagram.
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Limbs probably initially evolved to ____
A)walk on land B)swim in the ocean C)limbs have no function D)swim in shallow streams E)run
Environmental & Atmospheric Sciences
Describe the significance of the angle of repose
What will be an ideal response?
Environmental & Atmospheric Sciences
At present, most of the energy used in the United States is supplied by
A. fossil fuels. B. geothermal plants. C. nuclear power plants. D. hydroelectric plants.
Environmental & Atmospheric Sciences