Which one of the following is not an adaptation shown by modern birds?
A. a respiratory system that allows all of the air to pass through the lungs in one direction
B. modified beaks and feet to support feeding behavior
C. complete division of the heart into right and left halves
D. endothermy
E. wings and a long feathered tail
Answer: E
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Allocation of energy to reproduction reduces the amount of resources available for ________
Fill in the blank(s) with correct word
If you yell "boo" as you jump from behind a door and scare your friend, your friend turns pale because what constricts?
A. veins B. capillaries C. venules D. arterioles E. arteries
The "occupation" of a species in an area is identified as its:
A) habitat. B) niche. C) community. D) population.
To facilitate the regulation of membrane fluidity, E. coli has the enzyme
A) bacteriorhodopsin. B) desaturase. C) fatty acid convertase. D) gangliosidase. E) unsaturase.