PLEASE Percentage of oxygen in inhaled air and exhaled air experiment.
Aim:

Hypothesis:

Variables:
a. Manipulated
b. Responding
c. Constant

Apparatus/Material:

Figure:

Procedures/Methods:

Observations:

Interprete Data:

Discussion:

Conclusion:
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Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

The fauces connects which of th following structures to the oropharynx

Which would be the most useful source of evidence to support mcneill's contention?