For how many years did the human race rely upon hunting and gathering, with no agriculture?
A) 1,500,000 years
B) 1,000,000 years
C) 500,000 years
D) 250,000 years
D
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It is estimated that a flock of wood buffalo crane should be able to sustain an r of 0.085 for the foreseeable future. If the flock currently contains 350 individuals, how long will it take for that population to double?
A) between 7.0 and 9.0 years B) between 9.0 and 11.0 years C) between 11.0 and 13.0 years D) less than 7 years E) more than 13 years
What evidence suggests when oxygen gas first
became a significant part of Earth’s atmosphere?
a. multi-celled microorganisms that breathed oxygen b. fossils of dinosaurs c. molten rock from volcanoes that were rich in oxygen d. rusty rocks indicating oxidized iron e. the presence of water vapor in the atmosphere
Each of the following is classified as a genetic
disorder except _________, which is an abnormality. a. cystic fibrosis b. webbed toes c. hemophilia d. Down syndrome e. XYY
Which of the following choices lists in correct order the structures which a sound wave must vibrate in order to be sensed?
What will be an ideal response?