The appearance of lungs was a(n) ____ that drove the evolution of land vertebrates
a. key innovation
b. fixed trait
c. inbred trait
d. clade
e. stabilizing allele
ANSWER: a
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Plant root nodules are
A) formed from gall-rotting bacteria that decompose plant roots. B) harmful to plants, because the bacteria outcompete the plants for nutrients. C) sites where nitrogen fixation occurs. D) structures created by fungi and are found in all agricultural crops.
Prokaryotic cells can undergo meiosis
Indicate whether the statement is true or false.
Blood passing out of arterioles next enters the ____
a. capillaries b. arteries c. veins d. venules e. lymphatic vessels
Over 99% of the water filtered through the glomerulus is reabsorbed. At which one of the following locations does most of this water reabsorption occur?
A) loop of Henle B) distal tubule C) collecting duct D) proximal tubule E) renal pelvis