All of the following about Homo habilis is true except
A. the species lived in Africa for 500,000 years and then became extinct.
B. the species coexisted with dinosaurs.
C. the species was replaced by a new kind of human, which had a larger brain.
D. the species was small in stature.
E. the species was associated with tools.
B. the species coexisted with dinosaurs.
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During the 1960’s ecologists emphasized competition as the primary factor structuring communities
Indicate whether the statement is true or false.
Consistent levels of calcium and phosphate must be maintained in the blood. Low levels of these ions in the blood would therefore, stimulate the activity of ________.
Fill in the blank(s) with the appropriate word(s).
The source of the atmospheric oxygen necessary for the development of oxidative metabolism is thought to have been
a. glycolysis. b. the big bang. c. the breakdown of ATP. d. photosynthesis.
If an environment is acidic, is its pH lower than, equal to, or greater than 7?
A. The pH is greater than 7. B. The pH is lower than 7. C. The pH is equal to 7. D. The pH is lower than or equal to 7.