The genetic variation between human "races," such as Africans and Europeans, is greater than the variation within a single race
Indicate whether the statement is true or false
FALSE
Explanation: There is less variation between the human "races" than within a single race, showing that our concept of race has little genetic validity.
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The resting potential across a typical neuron
membrane is approximately __________ inside relative to outside. a. -70 microvolts b. -70 millivolts c. -70 volts d. +70 millivolts e. +70 megavolts
The current concept of a climax community states that forest communities:a
never reach a state of permanent equilibrium. b. never are disturbed. c. are determined solely by climate. d. are not permanently affected by fires or floods. e. are the inevitable end-point of succession.
Children who are pituitary dwarfs can now grow to normal height because of
A) large supplies of growth hormone from dead animals. B) the invention of synthetic growth hormone. C) genetic repair before birth. D) genetically engineered production of growth hormone by bacteria. E) pituitary transplants.
Order the following events that, according to Paul Wignell's hypothesis, may have caused the Permian mass extinction on both land and in the sea
A. acid rain B. global warming C. Siberian trap eruptions D. raised CO2 levels E. oceanic stagnation F. SO2, Cl, and F emissions Land: __ > __ > __ > terrestrial mass extinction Sea: __ > __ > __ > __ > marine mass extinction What will be an ideal response?