High- Flying Birds Are Able to Obtain Enough Oxygen Even

question 39

Multiple Choice

High- flying birds are able to obtain enough oxygen even when the air is very thin because

• A)they have reduced amounts of hemoglobin in their blood.
• B)their heart can increase or decrease in size as altitude changes.
• C)their mitochondria are more efficient than those of other vertebrates.
• D)they have more efficient lungs than other vertebrates.

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