More often, however, the fossil record shows that species appear quite suddenly and remain unchanged ______ over time.
What will be an ideal response?
phenotypically
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If you were highly allergic to bee stings, which of the following would be dangerous for you to do?
A. wearing sweet-smelling perfumes. B. wearing red shirts. C. wearing dark, drab clothing. D. humming as you work. E. None of the choices provided are dangerous.
Characteristics usually associated with life include all of the following except
a. motility. b. responsiveness to stimuli. c. reproduction. d. lack of change from generation to generation. e. a high degree of organization.
Anthrax, which means "charcoal" in Greek, derives its name from
A. the airborne endospores it produces. B. the staining properties of the bacillus under the microscope. C. the black eschars it produces on human skin. D. its ability to invade the bloodstream and produce toxemia. E. the high mortality it causes in infected individuals.
Cytoplasmic enzymes are most likely to be disrupted by ______.
A. UV light B. high temperatures C. detergents D. low temperatures