What is a property of a semiconductor that makes it useful in electronic devices? A. the electric force is weak

B. it allows for the flow of charges to be controlled

C. it is negatively charged

D. it repels the flow of charges

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.