The main features that place Homo habilis in the genus Homo rather than Australopithecus are
A. hand grip, extensive use of tools, and house-building.
B. care of young and altruistic behavior.
C. human facial appearance and lack of hair.
D. brain size, dentition, and tool use.
E. advanced use of language and total carnivorous diet.
Answer: D
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The formation and breaking of bonds between atoms requires
a. a chemical reaction. b. van der Walls forces. c. partial charges. d. an empty valence shell. e. an enzyme.
Which of the following is a byproduct of the hydrolysis of water in a light-dependent reaction?
a. Carbon dioxide b. Carbon c. Carbon monoxide d. Oxygen
A biologist from the United States Forest Service estimated the population of guppies in a pond to be 30,000 per cubic meter. This is also known as the
A. population density. B. density-dependent factor. C. natality. D. None of these answers is true.
Which of the following statements best describes Helicobacter pylori?
A) It is a gram-positive coccus that causes skin infections. B) It is a gram-negative spiral that causes ulcers. C) It lacks a cell wall and produces a lot of acid. D) It can be detected by testing for cold agglutinins.