Birds are able to sustain long flights at high altitudes because they
A) can extract oxygen during both inhalation and exhalation.
B) decrease their heart rate during flight.
C) use anaerobic metabolism during flight.
D) have thicker blood than other animals, with many more red blood cells.
E) are able to lower their body temperature during flight.
A
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The condition known as ketosis is characterized by
A) depleted ketobody levels B) depleted CoA levels C) fat oxidation to CO2. D) increases in blood pH E) both choices A and D
Which of the following statements about abscisic acid are true? Check all that apply.
_____It is produced chiefly in mature green leaves and in fruits. _____ It stimulates the growth of dormant buds. _____It promotes leaf senescence. _____It plays an important role in controlling the opening and closing of stomata. _____It plays a role in seed dormancy.
Answer the question using the accompanying figure. Water balance is maintained by the structures labeled ____
a. 1 and 3 b. 5 and 9 c. 7 and 8 d. 6 and 9 e. 1 and 6
The evolution of a genetically based, reciprocal adaptation in two or more interacting species is described as
coadaptation.
Indicate whether the statement is true or false.