Evidence shows that humans began to cultivate crops from approximately ____ years ago
a. 200,000
b. 100,000
c. 10,000
d. 2,000
e. 1,000
c
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What atom is responsible for the formation of free radicals in the mitochondria?
a. Calcium b. Hydrogen c. Sodium d. Iron e. Potassium
The most advanced stone tools were made by:
a. Homo habilis. b. Homo erectus. c. Neandertals. d. Cro-Magnons. e. Homo africanus.
Which of these events leads to all of the others in a pyrogenic (fever) response?
A) The hypothalamus releases prostaglandins. B) Endotoxin is released from the cell wall of gram-negative bacteria. C) The body's thermostat is set to a higher level, and fever occurs. D) IL-1 is released by macrophages. E) IL-1 travels via the blood to the hypothalamus.
What does it mean for a double helix of DNA to be antiparallel and complementary?
What will be an ideal response?