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. there is much more CO2 in the atmosphere at the higher altitudes than at sea level
C. the diaphragm cannot be contracted enough to produce a full breath
D. alveoli become compressed at the lower atmospheric pressures
A. the partial pressure of O2 becomes less than half that at sea level
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a. by air b. by birds c. by humans d. by wind
When submerged, frogs receive most of their O2 from capillaries within the skin. What structure would contain blood with the highest O2 concentration in a submerged frog, which is not able to breathe using its lungs?
A. left atrium B. ventricle C. right atrium D. pulmonary vein E. aorta
Mitochondrial DNA is designated by the shorthand form "nDNA".
a. true b. false
Which of the following is not predicted by a Punnett square?
1.the expected genotypic ratio of the offspring 2.the expected phenotypic ratio of the offspring 3.the number of offspring that will result 4.none of these; all are predicted