We use ________ to catalyze the chemical reactions of digestion
A) isotopes
B) alcohol molecules
C) nucleic acids
D) polycyclic aromatic hydrocarbons
E) enzymes
E
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On this map of the south Atlantic, why is the mid-ocean ridge in the center of the ocean?
A. Subduction has occurred under one and then another of the adjacent continents. B. Seafloor spreading has stopped in this area. C. Seafloor is added to both sides during seafloor spreading. D. Subduction is consuming seafloor beneath both adjacent continents.
Which organism, developing approximately 4.2 million years ago, represents the link between humans and apes?
A) Homo habilis B) Homo erectus C) Homo sapiens D) Australopithecus
What percentage of Earth's land surface is legally designated as preserves?
A) 22% B) 1% C) 12% D) 7% E) 31%
A(n) _______________ is a consolidated aggregate of various types of minerals or a consolidated aggregate of multiple individual pieces (grains) of the same kind of mineral
Fill in the blank(s) with correct word