The mechanism that allows many Na+ ions to move into the axon is
A. negative feedback.
B. positive feedback.
C. equilibrium feedback.
D. None of the choices are correct.
Answer: B. positive feedback.
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Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem?
A) the ecosystem's rate of primary production B) the production efficiency of the ecosystem's consumers C) the rate of decomposition in the ecosystem D) the trophic efficiency of the ecosystem E) the location of the nutrient reservoirs in the ecosystem
Schizogony
A. means multiple fissions. B. is performed by bacteria. C. is performed by protozoa. D. is a form of reproduction. E. means multiple fissions AND is performed by protozoa.
In males, genes on the X chromosome are
A) expressed. B) disease-causing. C) mutant. D) autosomal.
Immigration and emigration occur within a closed population
Indicate whether the statement is true or false