How many thoracic vertebrae are in the spinal column?
a. 5
b. 7
c. 12
d. 4
e. 15
C
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Strolling in the Sonoran Desert, you come upon a stately Saguaro cactus. The large central "trunks" of this cactus are covered with numerous smaller spines
The central stalks are modified _________ used for water storage and spines are modified ______ used for protection. A) stems; leaves B) leaves; leaves C) petioles; leaf blades D) leaf blades; trichomes E) stems; fruits
The molecule shown above is a(n) ____
a. amino acid b. monosaccharide c. steroid d. nucleotide e. phospholipid
How many gametes result from meiosis in a
female human?
a. 0 b. 1 c. 2 d. 3 e. 4
Organisms that must rely on complex, high-energy molecules produced by other organisms for survival are
A) heterotrophs. B) producers. C) autotrophs. D) cyanobacteria. E) denitrifying bacteria.